refactor: use pcre regexp engine for custom rule

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Summary

Supporting PCRE pattern for custom rule condition.

Proposed of changes

This PR fixes/implements the following bugs/features:

Feature #83

How has this been tested?

Proof:

Before

$ go test -run "^$" -bench "^BenchmarkInitializeCustomRule" -cpu=4 -count 10 | tee /tmp/old.txt 
goos: linux
goarch: amd64
pkg: github.com/kitabisa/teler-waf
cpu: 11th Gen Intel(R) Core(TM) i9-11900H @ 2.50GHz
BenchmarkInitializeCustomRules-4           1    2137316062 ns/op    51628184 B/op     137066 allocs/op
BenchmarkInitializeCustomRules-4          64      16842722 ns/op    40538818 B/op      86929 allocs/op
BenchmarkInitializeCustomRules-4          58      19287922 ns/op    40538565 B/op      86927 allocs/op
BenchmarkInitializeCustomRules-4          61      18448952 ns/op    40539070 B/op      86928 allocs/op
BenchmarkInitializeCustomRules-4          61      20377034 ns/op    40539019 B/op      86929 allocs/op
BenchmarkInitializeCustomRules-4          62      17853707 ns/op    40538648 B/op      86927 allocs/op
BenchmarkInitializeCustomRules-4          66      18291841 ns/op    40538705 B/op      86928 allocs/op
BenchmarkInitializeCustomRules-4          55      18771989 ns/op    40538675 B/op      86928 allocs/op
BenchmarkInitializeCustomRules-4          54      19569256 ns/op    40538421 B/op      86926 allocs/op
BenchmarkInitializeCustomRules-4          57      18205604 ns/op    40538455 B/op      86926 allocs/op
PASS
ok      github.com/kitabisa/teler-waf   14.273s

After

$ go test -run "^$" -bench "^BenchmarkInitializeCustomRule" -cpu=4 -count 10 | tee /tmp/new.txt 
goos: linux
goarch: amd64
pkg: github.com/kitabisa/teler-waf
cpu: 11th Gen Intel(R) Core(TM) i9-11900H @ 2.50GHz
BenchmarkInitializeCustomRules-4           1    1843819726 ns/op    51602368 B/op     137023 allocs/op
BenchmarkInitializeCustomRules-4          61      19268530 ns/op    40536153 B/op      86902 allocs/op
BenchmarkInitializeCustomRules-4          52      19921854 ns/op    40535659 B/op      86901 allocs/op
BenchmarkInitializeCustomRules-4          62      17659282 ns/op    40535529 B/op      86900 allocs/op
BenchmarkInitializeCustomRules-4          56      18588371 ns/op    40535385 B/op      86900 allocs/op
BenchmarkInitializeCustomRules-4          52      19926338 ns/op    40535689 B/op      86901 allocs/op
BenchmarkInitializeCustomRules-4          69      19771510 ns/op    40535983 B/op      86902 allocs/op
BenchmarkInitializeCustomRules-4          52      20148745 ns/op    40535630 B/op      86901 allocs/op
BenchmarkInitializeCustomRules-4          66      18331248 ns/op    40535946 B/op      86902 allocs/op
BenchmarkInitializeCustomRules-4          58      17675152 ns/op    40536178 B/op      86902 allocs/op
PASS
ok      github.com/kitabisa/teler-waf   13.790s

Conclusion

$ benchstat old.txt new.txt 
goos: linux
goarch: amd64
pkg: github.com/kitabisa/teler-waf
cpu: 11th Gen Intel(R) Core(TM) i9-11900H @ 2.50GHz
                        │   old.txt   │            new.txt            │
                        │   sec/op    │   sec/op     vs base          │
InitializeCustomRules-4   18.61m ± 9%   19.52m ± 9%  ~ (p=0.579 n=10)

                        │   old.txt    │               new.txt               │
                        │     B/op     │     B/op      vs base               │
InitializeCustomRules-4   38.66Mi ± 0%   38.66Mi ± 0%  -0.01% (p=0.001 n=10)

                        │   old.txt   │              new.txt               │
                        │  allocs/op  │  allocs/op   vs base               │
InitializeCustomRules-4   86.93k ± 0%   86.90k ± 0%  -0.03% (p=0.001 n=10)

Closing issues

Fixes #83

Checklist:

[x] My code follows the code style of this project.
[x] My changes successfully ran and pass linters locally (run make lint).
[x] I have written new tests for my changes.
- [x] My changes successfully ran and pass tests locally.
[ ] My change requires a change to the documentation.
- [ ] I have updated the documentation accordingly.

Codecov Report

Patch coverage: 80.00% and project coverage change: -0.97% :warning:

Comparison is base (d700f3b) 79.88% compared to head (024aca9) 78.91%. Report is 8 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #92 +/- ## ========================================== - Coverage 79.88% 78.91% -0.97% ========================================== Files 5 5 Lines 1059 1034 -25 ========================================== - Hits 846 816 -30 - Misses 162 164 +2 - Partials 51 54 +3 ``` | [Files Changed](https://app.codecov.io/gh/kitabisa/teler-waf/pull/92?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=kitabisa) | Coverage Δ | | |---|---|---| | [analyze.go](https://app.codecov.io/gh/kitabisa/teler-waf/pull/92?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=kitabisa#diff-YW5hbHl6ZS5nbw==) | `74.84% <80.00%> (+0.06%)` | :arrow_up: | | [teler.go](https://app.codecov.io/gh/kitabisa/teler-waf/pull/92?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=kitabisa#diff-dGVsZXIuZ28=) | `77.41% <80.00%> (-2.79%)` | :arrow_down: |

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teler-sh / teler-waf