http: Replace ConcurrencyLimiter with IDLocker

[mastercactapus]

Description:

• Replaces the usage on ConcurrencyLimiter with IDLocker.
• Updated HTTPError to handle rate-limits
• Added benchmarks for IDLocker
• Adds limit on concurrent Basic auth requests (per username)

Which issue(s) this PR fixes:
A follow-up to #2924

Out of Scope:
Deleting the ConcurrencyLimiter will be done in a separate PR to keep size/context down.

Additional Info:

goos: linux
goarch: amd64
pkg: github.com/target/goalert/app
cpu: AMD Ryzen 9 5900HX with Radeon Graphics  
BenchmarkConcurrencyLimiter_Sequential-16                	 4598095	       287.7 ns/op	      64 B/op	       2 allocs/op (1338.26MB)
BenchmarkConcurrencyLimiter_Sequential_Cardinality-16    	 1583104	       845.8 ns/op	     386 B/op	       8 allocs/op (955.74MB)
BenchmarkConcurrencyLimiter_Concurrent-16                	  708006	      1672 ns/op	     179 B/op	       3 allocs/op (315.64MB)
BenchmarkConcurrencyLimiter_Concurrent_Cardinality-16    	  341535	      3381 ns/op	     283 B/op	       6 allocs/op (140.26MB)

goos: linux
goarch: amd64
pkg: github.com/target/goalert/ctxlock
cpu: AMD Ryzen 9 5900HX with Radeon Graphics  
BenchmarkIDLocker_Sequential-16                	23114173	        50.12 ns/op	       0 B/op	       0 allocs/op (78.61MB)
BenchmarkIDLocker_Sequential_Cardinality-16    	11040678	       113.2 ns/op	       7 B/op	       0 allocs/op (84.63MB)
BenchmarkIDLocker_Concurrent-16                	  815606	      1457 ns/op	     130 B/op	       1 allocs/op (210.60MB)
BenchmarkIDLocker_Concurrent_Cardinality-16    	  594417	      1978 ns/op	      68 B/op	       1 allocs/op (54.25MB)