feat: implement new fine tuning job API

[henomis]

This PR implements new Fine Tuning Job API .

[codecov]

Codecov Report

Merging #479 (057559a) into master (a14bc10) will increase coverage by 0.22%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #479      +/-   ##
==========================================
+ Coverage   97.07%   97.30%   +0.22%     
==========================================
  Files          17       18       +1     
  Lines         719      780      +61     
==========================================
+ Hits          698      759      +61     
  Misses         15       15              
  Partials        6        6              

Files Changed	Coverage Δ
fine_tuning_job.go	100.00% <100.00%> (ø)

[sashabaranov]

Hey, thank you so much for coming up with a PR for a new functionality so quickly!

[sashabaranov]

Could we please use url.Values here?

Example from https://pkg.go.dev/net/url#Values.Encode

package main

import (
	"fmt"
	"net/url"
)

func main() {
	v := url.Values{}
	v.Add("cat sounds", "meow")
	v.Add("cat sounds", "mew/")
	v.Add("cat sounds", "mau$")
	fmt.Println(v.Encode())

}

[henomis]

done