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chainHead: Backport error codes from spec (#2539)
Alexandru Vasile authored 
This PR backports the error codes from the spec.

This relies on two specs for defining the error codes:
- Our rpc-spec-v2 https://github.com/paritytech/json-rpc-interface-spec.
- JSON-RPC spec https://www.jsonrpc.org/specification#error_object.

To better describe the error codes, they are divided into two separate
modules `rpc_spec_v2` and `json_rpc_spec` respectively.

The `InvalidSubscriptionID` and `FetchBlockHeader` are merged into the
JSON-RPC spec `INTERNAL_ERROR`.
While the other error codes are adjusted from spec.

Errors that are currently in use:
- -32801 block hash not reported by chainHead_follow or block hash has
been unpinned
- -32802 chainHead_follow started with withRuntime == false
- -32803 chainHead_follow did not generate an
operationWaitingForContinue event

The following are errors defined in the [JSON-RPC
spec](https://www.jsonrpc.org/specification#error_object):
- -32602 The provided parameter isn't one of the expected values, has
different format or is missing
- -32603 Internal server error

Note: Error `-32801` must be introduced and generated by the outstanding
https://github.com/paritytech/polkadot-sdk/issues/1505

Closes: https://github.com/paritytech/polkadot-sdk/issues/2530

---------

Signed-off-by: default avatarAlexandru Vasile <alexandru.vasile@parity.io>
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.cargo
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cumulus
docker
docs
polkadot
prdoc
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substrate
.gitignore
.gitlab-ci.yml
.rustfmt.toml
BRIDGES.md
Cargo.lock
Cargo.toml
README.md
README.md

NOTE: We have recently made significant changes to our repository structure. In order to streamline our development process and foster better contributions, we have merged three separate repositories Cumulus, Substrate and Polkadot into this repository. Read more about the changes here.

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