SEP-1034 : Support default values for all primitive types in elicitation schemas

[mikekistler]

Is your feature request related to a problem? Please describe.

Add support for SEP-1034, which is accepted for the next version of the MCP spec.

Describe the solution you'd like

All features of SEP-1034 are supported as described.

Describe alternatives you've considered
A clear and concise description of any alternative solutions or features you've considered.

Additional context
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