Add Benchmarks and Unit tests for parseRequestBody and improve it #714

```shell % go test -benchmem -bench=. -run=^Benchmark goos: darwin goarch: amd64 pkg: github.com/go-resty/resty/v2 cpu: Intel(R) Core(TM) i9-9880H CPU @ 2.30GHz Benchmark_parseRequestBody_string-16 2194669 550.2 ns/op 128 B/op 3 allocs/op Benchmark_parseRequestBody_byte-16 2260675 531.5 ns/op 128 B/op 3 allocs/op Benchmark_parseRequestBody_reader_with_SetContentLength-16 8393974 141.4 ns/op 16 B/op 1 allocs/op Benchmark_parseRequestBody_reader_without_SetContentLength-16 14253069 84.30 ns/op 0 B/op 0 allocs/op Benchmark_parseRequestBody_struct-16 880549 1307 ns/op 155 B/op 5 allocs/op Benchmark_parseRequestBody_struct_xml-16 424707 2886 ns/op 4762 B/op 13 allocs/op Benchmark_parseRequestBody_map-16 547629 2152 ns/op 569 B/op 15 allocs/op Benchmark_parseRequestBody_slice-16 959576 1264 ns/op 146 B/op 4 allocs/op Benchmark_parseRequestBody_FormData-16 973964 1243 ns/op 304 B/op 14 allocs/op Benchmark_parseRequestBody_MultiPart-16 98246 12320 ns/op 8746 B/op 131 allocs/op ```

Benchmarks: ``` Old: Benchmark_parseRequestBody_FormData-16 954213 1266 ns/op 304 B/op 14 allocs/op New: Benchmark_parseRequestBody_FormData-16 968466 1248 ns/op 280 B/op 10 allocs/op ```

Benchmarks: ``` Old: Benchmark_parseRequestBody_string-16 2199196 550.3 ns/op 128 B/op 3 allocs/op Benchmark_parseRequestBody_byte-16 2264421 532.9 ns/op 128 B/op 3 allocs/op Benchmark_parseRequestBody_reader-16 8307141 141.8 ns/op 16 B/op 1 allocs/op Benchmark_parseRequestBody_struct-16 931632 1317 ns/op 156 B/op 5 allocs/op Benchmark_parseRequestBody_struct_xml-16 409074 2921 ns/op 4765 B/op 13 allocs/op Benchmark_parseRequestBody_map-16 566750 2158 ns/op 570 B/op 15 allocs/op Benchmark_parseRequestBody_slice-16 957828 1279 ns/op 146 B/op 4 allocs/op New: Benchmark_parseRequestBody_string-16 5084247 237.0 ns/op 16 B/op 1 allocs/op Benchmark_parseRequestBody_byte-16 5298362 218.0 ns/op 16 B/op 1 allocs/op Benchmark_parseRequestBody_reader-16 8402954 141.3 ns/op 16 B/op 1 allocs/op Benchmark_parseRequestBody_struct-16 1000000 1066 ns/op 42 B/op 3 allocs/op Benchmark_parseRequestBody_struct_xml-16 452389 2575 ns/op 4648 B/op 11 allocs/op Benchmark_parseRequestBody_map-16 620391 1913 ns/op 457 B/op 13 allocs/op Benchmark_parseRequestBody_slice-16 1207551 1203 ns/op 32 B/op 2 allocs/op ```

Final benchmarks: ```shell % go test -benchmem -bench=. -run=^Benchmark goos: darwin goarch: amd64 pkg: github.com/go-resty/resty/v2 cpu: Intel(R) Core(TM) i9-9880H CPU @ 2.30GHz Benchmark_parseRequestBody_string-16 7623501 155.3 ns/op 16 B/op 1 allocs/op Benchmark_parseRequestBody_byte-16 8421992 141.6 ns/op 16 B/op 1 allocs/op Benchmark_parseRequestBody_reader_with_SetContentLength-16 17632350 67.37 ns/op 16 B/op 1 allocs/op Benchmark_parseRequestBody_reader_without_SetContentLength-16 26575016 45.34 ns/op 0 B/op 0 allocs/op Benchmark_parseRequestBody_struct-16 1243986 953.8 ns/op 40 B/op 2 allocs/op Benchmark_parseRequestBody_struct_xml-16 495250 2458 ns/op 4647 B/op 10 allocs/op Benchmark_parseRequestBody_map-16 694786 1761 ns/op 454 B/op 12 allocs/op Benchmark_parseRequestBody_slice-16 1304724 913.1 ns/op 32 B/op 2 allocs/op Benchmark_parseRequestBody_FormData-16 1000000 1128 ns/op 272 B/op 9 allocs/op Benchmark_parseRequestBody_MultiPart-16 93248 12583 ns/op 8738 B/op 130 allocs/op ```

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Add Benchmarks and Unit tests for parseRequestBody and improve it #714

Add Benchmarks and Unit tests for parseRequestBody and improve it #714

Commits on Oct 2, 2023