feat(cli): merge help output across builtin and project commands

[ElijahAhianyo]

Description

This PR merges the help text from the project's binary commands into cot-cli's help text. This is more of a best effort. When we can't locate the binary or extract metadata information, we fall back to the generic help text generated by Clap, which will not contain commands present in the project binary.

When there's a command present in both cot-cli and the project binary, we merge them

Type of change

• Bug fix
• New feature
• Documentation
• Refactor / cleanup
• Performance improvement
• Other (describe above)

[github-actions]

Bencher Report

Project	cot
Branch	elijah/cot-cli-proxy/stack-4-help
Testbed	github-ubuntu-latest

Click to view all benchmark results

Benchmark	Latency	Benchmark Result milliseconds (ms) (Result Δ%)	Upper Boundary milliseconds (ms) (Limit %)
empty_router/empty_router	📈 view plot 🚷 view threshold	15.28 ms (+61.55%) Baseline: 9.46 ms	17.95 ms (85.12%)
json_api/json_api	📈 view plot 🚷 view threshold	1.14 ms (+10.51%) Baseline: 1.03 ms	1.36 ms (83.55%)
nested_routers/nested_routers	📈 view plot 🚷 view threshold	1.05 ms (+9.20%) Baseline: 0.96 ms	1.25 ms (83.99%)
single_root_route/single_root_route	📈 view plot 🚷 view threshold	1.03 ms (+10.58%) Baseline: 0.93 ms	1.22 ms (84.34%)
single_root_route_burst/single_root_route_burst	📈 view plot 🚷 view threshold	16.77 ms (-0.31%) Baseline: 16.82 ms	21.43 ms (78.23%)

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[codecov]

Codecov Report

❌ Patch coverage is 98.24561% with 6 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
cot-cli/src/main.rs	94.66%	2 Missing and 2 partials ⚠️
cot-cli/src/handlers.rs	99.25%	0 Missing and 2 partials ⚠️

Flag	Coverage Δ
rust	90.02% <98.24%> (?)

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Files with missing lines	Coverage Δ
cot-cli/src/args.rs	100.00% <ø> (ø)
cot-cli/src/handlers.rs	98.79% <99.25%> (ø)
cot-cli/src/main.rs	88.95% <94.66%> (ø)

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