refactor: Prepare IR for JIT

[tusharmath]

• remove eval-trait
• remove eval from cache
• move http_executor out of io.rs
• update privacy
• remove eval trait
• move eval into eval.rs
• move models into model.rs
• rename modules
• drop modify.rs

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 85.71429% with 44 lines in your changes missing coverage. Please review.

Project coverage is 84.16%. Comparing base (634a605) to head (d448dd3).

Files	Patch %	Lines
src/core/ir/eval.rs	74.57%	15 Missing :warning:
src/core/ir/model.rs	79.10%	14 Missing :warning:
src/core/ir/eval_http.rs	90.81%	9 Missing :warning:
src/core/ir/eval_io.rs	96.05%	3 Missing :warning:
src/core/ir/eval_context.rs	66.66%	1 Missing :warning:
tailcall-query-plan/src/execution/executor.rs	0.00%	1 Missing :warning:
tailcall-query-plan/src/resolver.rs	0.00%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #2212 +/- ## ========================================== + Coverage 84.15% 84.16% +0.01% ========================================== Files 213 213 Lines 20149 20138 -11 ========================================== - Hits 16957 16950 -7 + Misses 3192 3188 -4 ```

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[github-actions[bot]]

Bencher

Report	Sun, June 16, 2024 at 09:40:59 UTC
Project	tailcall
Branch	2212/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)	7,085,200.00 (-0.58%)	7,266,195.86 (97.51%)
group_by	✅ (view plot)	541.73 (-5.76%)	644.43 (84.06%)
input/args.missing	✅ (view plot)	25.59 (+6.27%)	26.87 (95.24%)
input/args.nested.existing	✅ (view plot)	53.30 (+11.15%)	62.76 (84.93%)
input/args.nested.missing	✅ (view plot)	36.82 (-3.41%)	40.43 (91.08%)
input/args.root	✅ (view plot)	51.30 (+15.96%)	59.51 (86.20%)
input/headers.existing	✅ (view plot)	30.47 (-3.75%)	33.72 (90.37%)
input/headers.missing	✅ (view plot)	29.19 (-4.98%)	33.48 (87.18%)
input/value.missing	✅ (view plot)	23.55 (+0.32%)	25.09 (93.85%)
input/value.nested.existing	✅ (view plot)	40.54 (-2.57%)	45.12 (89.86%)
input/value.nested.missing	✅ (view plot)	36.37 (-0.64%)	38.61 (94.19%)
input/value.root	✅ (view plot)	37.68 (-1.36%)	41.66 (90.44%)
input/vars.existing	✅ (view plot)	7.48 (-5.03%)	8.90 (84.02%)
input/vars.missing	✅ (view plot)	10.80 (+13.16%)	12.85 (84.11%)
test_batched_body	✅ (view plot)	2,652.40 (-99.46%)	2,102,792.04 (0.13%)
test_batched_body #2	✅ (view plot)	1,622,200.00 (-4.89%)	1,832,524.87 (88.52%)
test_data_loader	✅ (view plot)	460,730.00 (-1.85%)	486,675.84 (94.67%)
test_handle_request	✅ (view plot)	153,790.00 (-1.97%)	173,608.80 (88.58%)
test_http_execute_method	✅ (view plot)	17,858.00 (-2.23%)	19,360.04 (92.24%)
with_mustache_expressions	✅ (view plot)	1,119.30 (-4.08%)	1,230.30 (90.98%)
with_mustache_literal	✅ (view plot)	671.20 (-6.97%)	774.32 (86.68%)

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