* Benchmarks for applying PathParams in parseRequestURL function
```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_parseRequestURL_PathParams-16 524658 2260 ns/op 448 B/op 9 allocs/op
PASS
ok github.com/go-resty/resty/v2 2.327s
```
* Benchmarks for applying QueryParams in parseRequestURL function
```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_parseRequestURL_QueryParams-16 865923 1371 ns/op 416 B/op 13 allocs/op
PASS
ok github.com/go-resty/resty/v2 2.491s
```
* improve the performance of applying the path parameters
* Use the map to collect all replacements and use replace all path parameters using O(1) logic
* Add additional unit tests to cover empty `{}` and not closed `{bar` path parameters
```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_parseRequestURL_PathParams-16 785971 1410 ns/op 320 B/op 6 allocs/op
PASS
ok github.com/go-resty/resty/v2 1.445s
```
* improve the performance of applying the query parameters
* improve the loging by adding the query parameters from the request first, then adding the parameters from the client and skip if already exists
* additional unit tests for the query parameters
```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_parseRequestURL_QueryParams-16 1000000 1158 ns/op 352 B/op 9 allocs/op
PASS
ok github.com/go-resty/resty/v2 2.473s
```
* using acquireBuffer
reusing a buffer from the pool decreases the allocs and memory usage
```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_parseRequestURL_PathParams-16 753834 1367 ns/op 256 B/op 5 allocs/op
Benchmark_parseRequestURL_QueryParams-16 1000000 1167 ns/op 352 B/op 9 allocs/op
PASS
ok github.com/go-resty/resty/v2 2.373s
```
* using reflect.DeepEqual to compare the expected and actual QueryParams
* update r.QueryParam isntead of creating new variable
* remove unneeded if