rpc-v2: Enable the `archive` class of methods (#3017)
The [archive](https://github.com/paritytech/json-rpc-interface-spec/blob/main/src/api/archive.md ) API is unstable and subject to change. This PR enables the `archive` class of the RPC-V2 spec to substrate based chains. The `archive` API is enabled for archive nodes: - the state of the blocks is in archive mode - the block's bodies are in archive mode While at it, this PR extends the `BlocksPrunning` enum with an `is_archive` helper to check if the pruning mode keeps the block's bodies for long enough. Defaults used for the `archive` API: - a maximum of 5 responses are provided for descendants queries (this is similar to chainHead) - a maximum of 8 item queries are accepted at a time Before stabilizing the API we should look into these defaults and adjust after collecting some data. --------- Signed-off-by: Alexandru Vasile <[email protected]>
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