feat: update rain.metadata submodule for RaindexSignedContextOracleV1

[hardyjosh]

Caution

Merge order: Merge rain.metadata#92 first, then update the submodule pointer here to main before merging.

Motivation

The orderbook SDK needs SignedContextOracleV1 from rain.metadata to support oracle discovery for signed context data.

Solution

Updates the rain.metadata submodule to include the SignedContextOracleV1 metadata type (magic 0xff7a1507ba4419ca).

Checks

By submitting this for review, I'm confirming I've done the following:

• made this PR as small as possible
• unit-tested any new functionality
• linked any relevant issues or PRs
• included screenshots (if this involves a front-end change)

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