chore: dropped pub fields from config module

[bnchi]

Summary:

• Refactor config module to use Derive getters

Issue Reference(s):
Fixes #2256

Build & Testing:

• [X] I ran cargo test successfully.
• [X] I have run ./lint.sh --mode=fix to fix all linting issues raised by ./lint.sh --mode=check.

Checklist:

• [X] I have added relevant unit & integration tests.
• [ ] I have updated the documentation accordingly.
• [X] I have performed a self-review of my code.
• [X] PR follows the naming convention of <type>(<optional scope>): <title>

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 87.50000% with 8 lines in your changes missing coverage. Please review.

Project coverage is 85.73%. Comparing base (78b6cac) to head (541fd9d). Report is 17 commits behind head on main.

Files	Patch %	Lines
src/cli/tc.rs	0.00%	6 Missing :warning:
tailcall-aws-lambda/src/main.rs	0.00%	2 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #2274 +/- ## ========================================== - Coverage 85.74% 85.73% -0.01% ========================================== Files 219 219 Lines 21022 21027 +5 ========================================== + Hits 18025 18028 +3 - Misses 2997 2999 +2 ```

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[github-actions[bot]]

Bencher

Report	Sun, June 23, 2024 at 16:29:55 UTC
Project	tailcall
Branch	2274/merge
Testbed	benchmarking-runner

Click to view all benchmark results

Benchmark	Latency	Latency Results nanoseconds (ns) | (Δ%)	Latency Upper Boundary nanoseconds (ns) | (%)
from_json_bench	✅ (view plot)	7,207,500.00 (+1.12%)	7,258,829.01 (99.29%)
group_by	✅ (view plot)	580.03 (+2.05%)	635.15 (91.32%)
input/args.missing	✅ (view plot)	25.50 (+5.71%)	27.42 (93.00%)
input/args.nested.existing	✅ (view plot)	54.22 (+13.54%)	62.11 (87.29%)
input/args.nested.missing	✅ (view plot)	38.68 (+1.58%)	40.91 (94.55%)
input/args.root	✅ (view plot)	51.60 (+16.83%)	59.27 (87.07%)
input/headers.existing	✅ (view plot)	30.33 (-4.07%)	33.81 (89.71%)
input/headers.missing	✅ (view plot)	29.59 (-3.64%)	33.64 (87.96%)
input/value.missing	✅ (view plot)	23.17 (-1.17%)	24.99 (92.69%)
input/value.nested.existing	✅ (view plot)	40.78 (-1.84%)	45.07 (90.50%)
input/value.nested.missing	✅ (view plot)	37.09 (+1.33%)	38.68 (95.90%)
input/value.root	✅ (view plot)	36.45 (-4.24%)	41.59 (87.65%)
input/vars.existing	✅ (view plot)	7.45 (-4.33%)	8.91 (83.63%)
input/vars.missing	✅ (view plot)	11.51 (+16.55%)	13.34 (86.31%)
synth_nested	✅ (view plot)	20,848.00 (-0.80%)	21,678.93 (96.17%)
test_batched_body	✅ (view plot)	2,688.10 (-99.16%)	1,705,243.78 (0.16%)
test_batched_body #2	✅ (view plot)	1,703,600.00 (+0.13%)	1,824,651.79 (93.37%)
test_data_loader	✅ (view plot)	470,240.00 (+0.22%)	486,180.35 (96.72%)
test_handle_request	✅ (view plot)	152,390.00 (-2.48%)	172,052.42 (88.57%)
test_http_execute_method	✅ (view plot)	18,542.00 (+1.99%)	19,280.84 (96.17%)
with_mustache_expressions	✅ (view plot)	1,187.10 (+1.76%)	1,231.32 (96.41%)
with_mustache_literal	✅ (view plot)	751.28 (+4.01%)	777.69 (96.60%)

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[github-actions[bot]]

Action required: PR inactive for 5 days. Status update or closure in 10 days.