Closes #40

Co-authored-by: Maciej Hirsz <[email protected]>

* Handle new paysFee enum

* Handle system.ExtrinsicFailed

* Staking and Vesting

* Add the endpoints to README

* Wording

* Version bump

* Bump @polkadot/api to 1.11.2

* Version bump

* Add /tx/artifacts[/:number] endpoints

* Bump version, add endpoints to readme

* Fix metadata

* Smarter fix to sanitizeNumbers

* Update api to 1.10.1, bump version

* Return status code 500 on error

* Version bump

* Update api to 1.8.1

* Version bump

* WIP submit tx

* Working tx submission

* fix: Account balances

* Version bump

* Update api to 1.6.2

* Bump version

* chore: Bump api to 1.5.1

* feat: Metadata endpoint

* feat: Update readme

* chore: Reset specVersion on metadata errors
* chore: version bump

Temporary fix for block 461694

Check and switch between metadata / registry for each block

Skip queryInfo on sudo module

Skip info for inherents

Extrinsic queryInfo, account nonce