v6.4.1

Upgrade priority: Low. Recommended for Kusama & Polkadot runtime 9110+

Changes:

• Adjust Statemint known types for version 4+
• Adjust balance derives to return multiple vesting schedules
• Adjust crowdloan derives to use paged key retrieval
• Ensure account indices (derived) are Accountindex types
• Adjust metadata v14 to include top-level type field from metadata
• Filter metadata v14 unused enum fields in TS generation
• Adjust derives to use more metadata v14 types on returns
• Add Kusama & Polkadot upgrade blocks for 9100/9110
• Align contract usage with latrest PortableRegistry (remove old-generation)
• Adjust contracts InstantiateReturnValue type (no rent projection after 267)
• Adjust for eslint v8 checks
• Don't run any online tests on CI by default (uncontrolled external dependencies)