chore: restructure workspace

[laststylebender14]

Summary:
restructured the workspace into following structure

src
  - cli/
  - core/
  - main.rs
  - lib.rs

Issue Reference(s):
Fixes #1853
Build & Testing:

• I ran cargo test successfully.
• 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.
• I have performed a self-review of my code.
• PR follows the naming convention of <type>(<optional scope>): <title>

[codecov]

Codecov Report

Attention: Patch coverage is 96.42857% with 6 lines in your changes are missing coverage. Please review.

Project coverage is 89.72%. Comparing base (940513f) to head (fe35af0).

Files	Patch %	Lines
src/core/http/cache.rs	90.00%	3 Missing ⚠️
src/core/generator/source.rs	90.00%	1 Missing ⚠️
src/core/http/showcase.rs	80.00%	1 Missing ⚠️
src/core/lambda/expression.rs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1887      +/-   ##
==========================================
+ Coverage   89.68%   89.72%   +0.04%     
==========================================
  Files         154      154              
  Lines       15840    15817      -23     
==========================================
- Hits        14206    14192      -14     
+ Misses       1634     1625       -9     

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[github-actions]

Bencher

Report	Thu, May 9, 2024 at 06:56:26 UTC
Project	tailcall
Branch	1887/merge
Testbed	benchmarking-runner

Click to view all benchmark results

Benchmark	Latency	Latency Results nanoseconds (ns) | (Δ%)	Latency Upper Boundary nanoseconds (ns) | (%)
group_by	✅ (view plot)	603.81 (-0.62%)	633.07 (95.38%)
input/args.missing	✅ (view plot)	23.23 (-7.85%)	26.82 (86.60%)
input/args.nested.existing	✅ (view plot)	40.59 (-26.09%)	64.19 (63.22%)
input/args.nested.missing	✅ (view plot)	37.78 (-2.62%)	40.15 (94.11%)
input/args.root	✅ (view plot)	38.99 (-24.42%)	60.11 (64.87%)
input/headers.existing	✅ (view plot)	31.47 (-0.57%)	32.70 (96.24%)
input/headers.missing	✅ (view plot)	30.70 (+0.64%)	31.92 (96.19%)
input/value.missing	✅ (view plot)	23.25 (-1.29%)	25.07 (92.74%)
input/value.nested.existing	✅ (view plot)	41.68 (+0.90%)	43.14 (96.61%)
input/value.nested.missing	✅ (view plot)	38.06 (+5.19%)	38.07 (100.00%)
input/value.root	✅ (view plot)	38.13 (-1.49%)	39.95 (95.44%)
input/vars.existing	✅ (view plot)	7.50 (-9.83%)	8.98 (83.54%)
input/vars.missing	✅ (view plot)	8.67 (+6.75%)	8.94 (96.96%)
test_batched_body	✅ (view plot)	2,757.20 (-99.75%)	2,834,000.42 (0.10%)
test_batched_body #2	✅ (view plot)	1,720,600.00 (-3.23%)	1,905,976.19 (90.27%)
test_data_loader	✅ (view plot)	476,110.00 (+0.53%)	490,979.89 (96.97%)
with_mustache_expressions	✅ (view plot)	1,153.50 (-1.63%)	1,236.21 (93.31%)
with_mustache_literal	✅ (view plot)	718.45 (-0.48%)	762.15 (94.27%)

Bencher - Continuous Benchmarking
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