Improve generative/reranker config UX

[tsmith023]

• Allow updating of generative and reranker configs dynamically
• Fix typing issues with generative and reranker configs

Closes #222

[orca-security-eu]

Orca Security Scan Summary

Status	Check	Issues by priority
Passed	Infrastructure as Code	0   0   0   0	View in Orca
Passed	SAST	0   2   0   0	View in Orca
Passed	Secrets	0   0   0   0	View in Orca
Passed	Vulnerabilities	0   0   0   0	View in Orca

🛡️ The following SAST misconfigurations have been detected

	NAME	FILE
	Detects Potential Object Injection via User Input	...ns/config/classes.ts	View in code
	Detects Potential Object Injection via User Input	...ns/config/classes.ts	View in code

[bevzzz]

Small nitpick in the tests, LGTM besides that

[weaviate-git-bot]

Great to see you again! Thanks for the contribution.

beep boop - the Weaviate bot 👋🤖

PS:
Are you already a member of the Weaviate Slack channel?