feat: Add support for ERC-8132: Gas Limit Override Capability

[ajhodges]

Summary

Implements ERC-8132 Gas Limit Override Capability, allowing apps to specify per-call gas limits in wallet_sendCalls requests.

Changes:

• Add gasLimitOverride capability to wallet_getCapabilities response under 0x0 (all chains)
• Add TypeScript types for call-level and wallet-level capabilities
• Add validation for gas limit values (non-zero, within block gas limit)
• Pass through per-call capabilities to wallet_prepareCalls

Note: ERC-8132 is currently in draft status. Consider releasing via canary only until the ERC is finalized.

How did you test your changes?

• Added 4 unit tests for wallet_getCapabilities returning gasLimitOverride under 0x0
• Added 5 unit tests for gas limit validation (zero values, exceeds max, batch validation)

[cb-heimdall]

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