refactor: add AI client and unit tests #338

Job	Run time
go-versions / go-versions	3s
Windows, Go 1.23	57s
Windows, Go 1.22	3m 12s
Windows, Go 1.18	1m 24s
Linux, Go 1.22 / Unit Tests and Coverage	53s
Linux, Go 1.18 / Contract Tests	1m 28s
Linux, Go 1.18 / Benchmarks	4m 39s
Linux, Go 1.18 / Unit Tests and Coverage	55s
Linux, Go 1.22 / Benchmarks	4m 40s
Linux, Go 1.22 / Contract Tests	1m 19s
Linux, Go 1.23 / Benchmarks	4m 31s
Linux, Go 1.23 / Contract Tests	1m 14s
Linux, Go 1.23 / Unit Tests and Coverage	50s
	26m 5s

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