feat(elicitation): Add support URL elicitation. SEP-1036

[pbezglasny]

Motivation and Context

Implement SEP-1036 URL Mode Elicitation. Issue #513

Changes:

• Change CreateElicitationRequestParam struct to enum with two options: FormElicitationParam and UrlElicitationParam
• Added elicit_url and elicit_url_with_timeout methods to Peer
• Added notification for notifications/elicitation/complete

How Has This Been Tested?

• Added new unit/integration tests
• Manual test with custom build of inspector feat(elicitation): Add URL elicitation support. SEP-1036 inspector#994

Breaking Changes

Next signatures of struct/functions changed:

• CreateElicitationRequestParam now enum with option of form or url
• changed supported_elicitation to supported_elicitation_modes with different return type in Peer

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)
• Documentation update

Checklist

• I have read the MCP Documentation
• My code follows the repository's style guidelines
• New and existing tests pass locally
• I have added appropriate error handling
• I have added or updated documentation as needed

Additional context