fix: bump polkadot-js deps

[TarikGul]

This iteration of bumping the polkadot-js introduces many breaking changes.

1. Imports for types have changed. For Codec types the import now comes from @polkadot/types-codec

2. Block.registry -> CodecRegistry (which does not contain the createType method), therefore we replace it with the historicApis Registry.

3. Add import '@polkadot/api-augment'; to the entry file noted by the @polkadot/api release in order to maintain the types used in the codebase.

4. Retrieve PromiseRpcResult from @polkadot/api-base/types

Changed polkadot versions:

    "@polkadot/api": "^7.0.1",
    "@polkadot/apps-config": "0.98.2-164",
    "@polkadot/util-crypto": "^8.2.2",

closes: #771

[maciejhirsz]

Looks clean to me!