Add /health endpoint for watch

[prymitive]

No description provided.

[github-actions]

This pull request was validated by pint.

✔️ No problems found

Stats

Stat	Value
Version	v0.69.1-21-gf7fdaa2
Number of rules parsed	4
Number of rules checked	4
Number of problems found	0
Number of offline checks	0
Number of online checks	0
Checks duration	0

Problems

No problems reported

[github-actions]

Benchmark diff:

goos: linux
goarch: amd64
pkg: github.com/cloudflare/pint/cmd/pint
cpu: AMD EPYC 7763 64-Core Processor                
              │   old.txt   │              new.txt               │
              │   sec/op    │   sec/op     vs base               │
FindEntries-4   39.58m ± 3%   39.68m ± 5%       ~ (p=0.353 n=10)
CheckRules-4     8.510 ± 2%    8.533 ± 2%       ~ (p=0.393 n=10)
geomean         580.4m        581.9m       +0.26%

              │   old.txt    │               new.txt               │
              │     B/op     │     B/op      vs base               │
FindEntries-4   27.40Mi ± 0%   27.40Mi ± 0%       ~ (p=0.986 n=10)
CheckRules-4    977.7Mi ± 0%   977.6Mi ± 0%       ~ (p=0.853 n=10)
geomean         163.7Mi        163.7Mi       -0.00%

              │   old.txt   │              new.txt               │
              │  allocs/op  │  allocs/op   vs base               │
FindEntries-4   131.7k ± 0%   131.7k ± 0%       ~ (p=0.416 n=10)
CheckRules-4    14.15M ± 0%   14.15M ± 0%       ~ (p=0.739 n=10)
geomean         1.365M        1.365M       +0.00%

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 3 lines in your changes missing coverage. Please review.

Project coverage is 95.07%. Comparing base (d5daa5b) to head (f7fdaa2).

Files with missing lines	Patch %	Lines
cmd/pint/watch.go	0.00%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1237      +/-   ##
==========================================
- Coverage   95.09%   95.07%   -0.03%     
==========================================
  Files         105      105              
  Lines       12637    12640       +3     
==========================================
  Hits        12017    12017              
- Misses        471      473       +2     
- Partials      149      150       +1     

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