Description

IMPORTANT: This is a breaking change and must not be merged without a storage migration ready.

This PR's goal is to make previously missing committee member data available in the runtime: MC pubkey and type of candidate (permissioned, trustless)

• Makes committee member data a generic type in pallet-session-validator-management::Config
• Provides a CommitteeMemberInfo enum in the runtime to instantiate this generic type, which distinguishes between trustless and permissioned members and contains MC Public Key for the former

Follow up changes necessary:

• storage migration: easiest way is to treat all members stored on runtime upgrade as permissioned
• wizards update: at least build-spec
• documentation / migration guide

Checklist

• Commit sequence broadly makes sense and commits have useful messages.
• New tests are added if needed and existing tests are updated.
• Relevant logging and metrics added
• CI passes. See note on CI.
• Any changes are noted in the changelog.md for affected crate
• Self-reviewed the diff

Note on CI

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