Remove `ToolArgs` and `ToolResult`.

[nomisRev]

Motivation and Context

Proposal for KG-270 Remove ToolArgs, and ToolResult. By removing ToolArgs and ToolResult we can more freely model tools, and we can improve support tools by deriving ToolDescription from KSerializer<A> .

This also allows ProvideSubgraphResult to be completely transparent to the user and automatically derived from KSerializer.

Breaking Changes

Tool<A, B> now requires defining override val resultSerializer: KSerializer<A>. Binary breaking was kept to a minimum by leveraging @Depracated and ReplaceWith.

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Type of the changes

• [ ] New feature (non-breaking change which adds functionality)
• [ ] Bug fix (non-breaking change which fixes an issue)
• [x] Breaking change (fix or feature that would cause existing functionality to change)
• [ ] Documentation update
• [ ] Tests improvement
• [x] Refactoring

Checklist

• [x] The pull request has a description of the proposed change
• [x] I read the Contributing Guidelines before opening the pull request
• [x] The pull request uses develop as the base branch
• [x] Tests for the changes have been added
• [ ] All new and existing tests passed

Additional steps for pull requests adding a new feature

• [x] An issue describing the proposed change exists
• [x] The pull request includes a link to the issue
• [ ] The change was discussed and approved in the issue (Discussed with @Ololoshechkin on JetBrains Slack)
• [ ] Docs have been added / updated