Feat/add metadata to mcp output and context to mcp handler

[clriesco]

Description

• Added metadata (credits and tx hash) to mcp server output.
• Added payment context to mcp handler

Is this PR related with an open issue?

Related to Issue #

Types of changes

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

Checklist:

• Follows the code style of this project.
• Tests Cover Changes
• Documentation

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