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:

• [] 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 92.00000% with 6 lines in your changes missing coverage. Please review.

Project coverage is 85.72%. Comparing base (ff14331) to head (67bea91). Report is 3 commits behind head on main.

Files	Patch %	Lines
src/cli/tc.rs	0.00%	5 Missing :warning:
tailcall-aws-lambda/src/main.rs	0.00%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #2263 +/- ## ========================================== + Coverage 85.69% 85.72% +0.03% ========================================== Files 219 219 Lines 21043 21061 +18 ========================================== + Hits 18033 18055 +22 + Misses 3010 3006 -4 ```

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[github-actions[bot]]

Bencher

Report	Sun, June 23, 2024 at 12:10:21 UTC
Project	tailcall
Branch	2263/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)	7,103,700.00 (-0.27%)	7,255,910.93 (97.90%)
group_by	✅ (view plot)	569.64 (-0.03%)	637.68 (89.33%)
input/args.missing	✅ (view plot)	25.52 (+5.84%)	27.40 (93.17%)
input/args.nested.existing	✅ (view plot)	54.91 (+14.93%)	62.20 (88.28%)
input/args.nested.missing	✅ (view plot)	39.72 (+4.24%)	40.94 (97.02%)
input/args.root	✅ (view plot)	51.54 (+16.56%)	59.44 (86.71%)
input/headers.existing	✅ (view plot)	32.70 (+3.39%)	33.79 (96.78%)
input/headers.missing	✅ (view plot)	31.73 (+3.32%)	33.62 (94.40%)
input/value.missing	✅ (view plot)	23.23 (-0.96%)	25.00 (92.90%)
input/value.nested.existing	✅ (view plot)	40.56 (-2.36%)	45.07 (90.00%)
input/value.nested.missing	✅ (view plot)	37.03 (+1.20%)	38.68 (95.72%)
input/value.root	✅ (view plot)	35.32 (-7.28%)	41.62 (84.86%)
input/vars.existing	✅ (view plot)	7.47 (-4.03%)	8.70 (85.85%)
input/vars.missing	✅ (view plot)	11.37 (+16.28%)	13.16 (86.42%)
synth_nested	✅ (view plot)	22,453.00 (+5.43%)	23,225.29 (96.67%)
test_batched_body	✅ (view plot)	2,876.30 (-99.20%)	1,807,848.75 (0.16%)
test_batched_body #2	✅ (view plot)	1,631,400.00 (-4.13%)	1,826,043.26 (89.34%)
test_data_loader	✅ (view plot)	464,370.00 (-1.03%)	486,098.88 (95.53%)
test_handle_request	✅ (view plot)	152,750.00 (-2.33%)	172,376.72 (88.61%)
test_http_execute_method	✅ (view plot)	18,222.00 (+0.10%)	19,294.52 (94.44%)
with_mustache_expressions	✅ (view plot)	1,183.20 (+1.44%)	1,230.77 (96.13%)
with_mustache_literal	✅ (view plot)	697.71 (-3.25%)	775.13 (90.01%)

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[tusharmath]

Merged it by mistake

[bnchi]

Merged it by mistake

re-opened here #2274

@tusharmath