perf: avoid allocations with (*regexp.Regexp).MatchString

[Juneezee]

Description

We should use (*regexp.Regexp).MatchString instead of (*regexp.Regexp).Match([]byte(...)) when matching string to avoid unnecessary []byte conversions and reduce allocations.

Example benchmark:

func BenchmarkMatch(b *testing.B) {
	for i := 0; i < b.N; i++ {
		if match := looksLikeUrl.Match([]byte("https://www.example.com")); !match {
			b.Fail()
		}
	}
}

func BenchmarkMatchString(b *testing.B) {
	for i := 0; i < b.N; i++ {
		if match := looksLikeUrl.MatchString("https://www.example.com"); !match {
			b.Fail()
		}
	}
}

Result:

goos: linux
goarch: amd64
pkg: github.com/bearer/bearer/internal/parser/interfaces/paths cpu: AMD Ryzen 7 PRO 4750U with Radeon Graphics
BenchmarkMatch-16          	 1788562	       812.1 ns/op	      24 B/op	       1 allocs/op
BenchmarkMatchString-16    	 2106370	       517.8 ns/op	       0 B/op	       0 allocs/op
PASS
ok  	github.com/bearer/bearer/internal/parser/interfaces/paths	3.628s

Checklist

• I've added test coverage that shows my fix or feature works as expected.
• I've updated or added documentation if required.
• I've included usage information in the description if CLI behavior was updated or added.
• PR title follows Conventional Commits format

[cfabianski]

Thanks @Juneezee will wait for the CI and merge ❤️