Add openai textgen processor (#2169)

* code move

* fix lint

* fix README.md lint

* paramgen

* Update pkg/plugin/processor/builtin/impl/openai-textgen/textgen.go

Co-authored-by: Gaurav Kumar Sahil <[email protected]>

* Update pkg/plugin/processor/builtin/impl/openai-textgen/textgen.go

Co-authored-by: Gaurav Kumar Sahil <[email protected]>

* apply code review edits

* apply fix

* add backoff

* apply pr suggestion

* add examples

* fix version

* fix go generate

---------

Co-authored-by: Guillem <[email protected]>
Co-authored-by: Gaurav Kumar Sahil <[email protected]>

Author: 3 people

go.mod

@@ -41,6 +41,7 @@ require (
 	github.com/prometheus/client_model v0.6.1
 	github.com/prometheus/common v0.62.0
 	github.com/rs/zerolog v1.33.0
+	github.com/sashabaranov/go-openai v1.37.0
 	github.com/sourcegraph/conc v0.3.0
 	github.com/spf13/cobra v1.9.1
 	github.com/spf13/pflag v1.0.6

go.sum

@@ -813,6 +813,8 @@ github.com/sanposhiho/wastedassign/v2 v2.1.0 h1:crurBF7fJKIORrV85u9UUpePDYGWnwvv
 github.com/sanposhiho/wastedassign/v2 v2.1.0/go.mod h1:+oSmSC+9bQ+VUAxA66nBb0Z7N8CK7mscKTDYC6aIek4=
 github.com/santhosh-tekuri/jsonschema/v6 v6.0.1 h1:PKK9DyHxif4LZo+uQSgXNqs0jj5+xZwwfKHgph2lxBw=
 github.com/santhosh-tekuri/jsonschema/v6 v6.0.1/go.mod h1:JXeL+ps8p7/KNMjDQk3TCwPpBy0wYklyWTfbkIzdIFU=
+github.com/sashabaranov/go-openai v1.37.0 h1:hQQowgYm4OXJ1Z/wTrE+XZaO20BYsL0R3uRPSpfNZkY=
+github.com/sashabaranov/go-openai v1.37.0/go.mod h1:lj5b/K+zjTSFxVLijLSTDZuP7adOgerWeFyZLUhAKRg=
 github.com/sashamelentyev/interfacebloat v1.1.0 h1:xdRdJp0irL086OyW1H/RTZTr1h/tMEOsumirXcOJqAw=
 github.com/sashamelentyev/interfacebloat v1.1.0/go.mod h1:+Y9yU5YdTkrNvoX0xHc84dxiN1iBi9+G8zZIhPVoNjQ=
 github.com/sashamelentyev/usestdlibvars v1.28.0 h1:jZnudE2zKCtYlGzLVreNp5pmCdOxXUzwsMDBkR21cyQ=