Api Version 0.0.6

This release ships support for API version 0.0.6 in mappings:

• Added nonce field for Transaction objects.
• Added baseFeePerGas field for Block objects (EIP-1559).

Block Cache Invalidation and Reset

All cached block data must be refetched to account for the new Block and Trasaction
struct versions, so this release includes a graph-node startup check that will:

1. Truncate all block cache tables.
2. Bump the db_version value from 2 to 3.

(Table truncation is a fast operation and no downtime will occur because of that.)

Ethereum

• 'Out of gas' errors on contract calls are now considered deterministic errors,
  so they can be handled by try_ calls. The gas limit is 50 million.

Environment Variables

• The GRAPH_ETH_CALL_GAS environment is removed to prevent misuse, its value
  is now hardcoded to 50 million.

Multiblockchain

• Initial support for NEAR subgraphs.
• Added FirehoseBlockStream implementation of BlockStream (#2716)

Misc

• Rust docker image is now based on Debian Buster.
• Optimizations to the PostgreSQL notification queue.
• Improve PostgreSQL robustness in multi-sharded setups. (#2815)
• Added 'networks' to the 'subgraphFeatures' endpoint. (#2826)
• Check and limit the size of GraphQL query results. (#2845)
• Allow _in and _not_in GraphQL filters. (#2841)
• Add PoI for failed subgraphs. (#2748)
• Make graphman rewind safer to use. (#2879)
• Add subgraphErrors for all GraphQL schemas. (#2894)
• Add Graph-Attestable response header. (#2946)
• Add support for minimum block constraint in GraphQL queries (number_gte) (#2868).
• Handle revert cases from Hardhat and Ganache (#2984)
• Fix bug on experimental prefetching optimization feature (#2899)