Add the minsev package

[MrAlias]

Resolve https://github.com/open-telemetry/opentelemetry-go/issues/5078

Add the experimental minsev module. This module provides a log processor that thresholds all records recorded to being above a minimum severity.

Benchmarks

goos: linux
goarch: amd64
pkg: go.opentelemetry.io/contrib/processors/minsev
cpu: Intel(R) Core(TM) i7-8550U CPU @ 1.80GHz
                        │   new.txt   │
                        │   sec/op    │
LogProcessor/Base-8       20.53n ± 2%
LogProcessor/Enabled-8    41.27n ± 5%
LogProcessor/Disabled-8   22.34n ± 8%
geomean                   26.65n

                        │   new.txt    │
                        │     B/op     │
LogProcessor/Base-8       0.000 ± 0%
LogProcessor/Enabled-8    0.000 ± 0%
LogProcessor/Disabled-8   0.000 ± 0%
geomean                              ¹
¹ summaries must be >0 to compute geomean

                        │   new.txt    │
                        │  allocs/op   │
LogProcessor/Base-8       0.000 ± 0%
LogProcessor/Enabled-8    0.000 ± 0%
LogProcessor/Disabled-8   0.000 ± 0%
geomean                              ¹
¹ summaries must be >0 to compute geomean

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 64.6%. Comparing base (6e8528b) to head (2b00247).

Additional details and impacted files

[](https://app.codecov.io/gh/open-telemetry/opentelemetry-go-contrib/pull/5817?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=open-telemetry) ```diff @@ Coverage Diff @@ ## main #5817 +/- ## ===================================== Coverage 64.5% 64.6% ===================================== Files 201 202 +1 Lines 12577 12591 +14 ===================================== + Hits 8120 8134 +14 Misses 4221 4221 Partials 236 236 ``` | [Files](https://app.codecov.io/gh/open-telemetry/opentelemetry-go-contrib/pull/5817?dropdown=coverage&src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=open-telemetry) | Coverage Δ | | |---|---|---| | [processors/minsev/minsev.go](https://app.codecov.io/gh/open-telemetry/opentelemetry-go-contrib/pull/5817?src=pr&el=tree&filepath=processors%2Fminsev%2Fminsev.go&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=open-telemetry#diff-cHJvY2Vzc29ycy9taW5zZXYvbWluc2V2Lmdv) | `100.0% <100.0%> (ø)` | |