Substreams improvements

Performance

• Changed cache file format for stores and outputs (faster with vtproto) -- requires removing the existing state files
• Various improvements to scheduling

Fixes

• Fixed eth_call handler not flagging out of gas error as deterministic.
• Fixed Memory leak in wasmtime
• • Hotfix 'nil pointer' panic when saving uninitialized cache (from unreleased v1.2.1 tag)

Merger fixes

• Removed the unused 'previous' one-block in merged-blocks (99 inside bundle:100)
• Fix: also prevent rare bug of bundling "very old" one-blocks in merged-blocks