feat: add tools to assistant

[pixelass]

Motivation

• adds ComfyUI tool to allow assistants to generate images.
• images are stored and multiple images can be generated in one call (e.g. prompt: "Write a story with two images"
• adds RAG as tool and removes previous RAG implementation

Issues closed

closes #328

[codacy-production]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
✅ +0.00% (target: -1.00%)	✅ 100.00%

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (34a7b34)	2114	1986	93.95%
Head commit (45f3011)	2114 (+0)	1986 (+0)	93.95% (+0.00%)

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#329)	3	3	100.00%

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

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[TimPietrusky]

Looks nice, just two minor changes!

[TimPietrusky]

LGTM, LGTM!

[TimPietrusky]

🎉 This PR is included in version 1.0.0-alpha.100 🎉

The release is available on GitHub release

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