refactor: use b.Loop() in benchmark tests for better performance

[suranmiao]

These changes use b.Loop() to simplify the code and improve performance
Supported by Go Team, more info: https://go.dev/blog/testing-b-loop and https://go.dev/issue/73137.

Before:

 go test -run=^$ -bench=. ./blob  
goos: darwin
goarch: arm64
pkg: github.com/celestiaorg/celestia-node/blob
cpu: Apple M4
BenchmarkGetByCommitment-10    	    4675	    336084 ns/op	 1053903 B/op	    3418 allocs/op
PASS
ok  	github.com/celestiaorg/celestia-node/blob	3.784s

---

go test -run=^$ -bench=. ./header/headertest    
goos: darwin
goarch: arm64
pkg: github.com/celestiaorg/celestia-node/header/headertest
cpu: Apple M4
BenchmarkMsgID-10    	   39388	     33899 ns/op	  165967 B/op	     593 allocs/op
PASS
ok  	github.com/celestiaorg/celestia-node/header/headertest	2.866s

---

go test -run=^$ -bench=. ./share/shwap                 
goos: darwin
goarch: arm64
pkg: github.com/celestiaorg/celestia-node/share/shwap
cpu: Apple M4
BenchmarkRowValidate-10       	   37148	     32432 ns/op
BenchmarkSampleValidate-10    	 1000000	      1137 ns/op
PASS
ok  	github.com/celestiaorg/celestia-node/share/shwap	3.656s

After:

go test -run=^$ -bench=. ./blob       
goos: darwin
goarch: arm64
pkg: github.com/celestiaorg/celestia-node/blob
cpu: Apple M4
BenchmarkGetByCommitment-10    	    6092	    195211 ns/op	 1053908 B/op	    3418 allocs/op
PASS
ok  	github.com/celestiaorg/celestia-node/blob	3.558s


---

go test -run=^$ -bench=. ./header/headertest    
goos: darwin
goarch: arm64
pkg: github.com/celestiaorg/celestia-node/header/headertest
cpu: Apple M4
BenchmarkMsgID-10    	   59661	     20424 ns/op	  165957 B/op	     593 allocs/op
PASS
ok  	github.com/celestiaorg/celestia-node/header/headertest	2.491s

---


 go test -run=^$ -bench=. ./share/shwap  
goos: darwin
goarch: arm64
pkg: github.com/celestiaorg/celestia-node/share/shwap
cpu: Apple M4
BenchmarkRowValidate-10       	   35263	     33798 ns/op
BenchmarkSampleValidate-10    	  996700	      1180 ns/op
PASS
ok  	github.com/celestiaorg/celestia-node/share/shwap	3.404s

[suranmiao]

@renaynay @Wondertan Hi, Could you please review this PR at your convenience? Thank you very much.