Add authMode to simulateTransaction endpoint

[Shaptic]

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[Copilot]

Pull request overview

This PR extends the simulateTransaction RPC method to accept an optional authMode parameter and wires it through the OpenRPC source schema and the generated static spec.

Changes:

• Add an AuthMode schema defining the allowed authorization modes (enforce, record, record_allow_nonroot) for simulations.
• Add an AuthMode content descriptor and reference it from the simulateTransaction method’s parameter list.
• Update the generated static/stellar-rpc.openrpc.json to include the new authMode parameter with matching schema and documentation.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
static/stellar-rpc.openrpc.json	Inlines the new optional authMode parameter for simulateTransaction, including enum and descriptions.
openrpc/src/stellar-rpc/schemas/AuthMode.json	Defines the AuthMode string enum schema and its documentation for reuse.
openrpc/src/stellar-rpc/methods/simulateTransaction.json	Extends the method’s params to include the new AuthMode content descriptor.
openrpc/src/stellar-rpc/contentDescriptors/AuthMode.json	Introduces the authMode content descriptor that ties the parameter definition to the AuthMode schema.

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