fix: ToolFromCallable with custom name

[nicolasf]

Fixes @Tool("customName") not working after #791.
The name of the Tool should read from descriptor.name.

Motivation and Context

Fixes custom tool naming on @Tool annotated functions.

Breaking Changes

None

Type of the changes

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

Checklist

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

[nicolasf]

Hi @Ololoshechkin. Can you review this before publishing 0.5.0?
It's a blocker issue for me while testing from the development branch.
Thanks!