Polkadot API (PAPI) Integration PR

[rossbulat]

This PR integrates Polkadot API into the staking dashboard, replacing and discontinuing Polkadot JS API.

Note: This refactor will have no effect on end users.

• Initialisation
• Constants
• Runtime APIs
• Storage Queries
• Transaction Submission

Commit Log

• Initialise Polkadot API with Smoldot & Websocket Support, and retrieve chain spec.
• Expose untyped API client.
• Destroy pApi on disconnect.
• Fetch dashboard constants via pApi.
• Fetch the active era via pApi.
• Fetch network metadata via pApi.
• Move activeEra logic to a Subscription class.
• Refactor BlockNumber Subscription to pApi class.
• Add RXJS for typing and observable utility support.
• Refactor NetworkMetrics Subscription to pApi class.
• Refactor PoolsConfig Subscription to pApi class.
• Refactor StakingMetrics Subscription to pApi class.
• Fetch chain version metadata and add to chain specs.
• Refactor fetching of validator entries via ValidatorEntries pApi class.
• Refactor fetching of erasStakersOverview to ErasStakersOverview pApi class.
• Refactor fetching of erasStakersPaged to ErasStakersPaged pApi class.
• Refactor fetching of bonded pools via BondedPoolEntries pApi class.
• Add dedicated directory for entries fetching
• Refactor fetching of bonded accounts to a pApi Subscription class.
• Use substrate-bindings to generate pool addresses.
• Refactor Fast Unstake config to be a separate pApi Subscription class.
• Abstract Fast Unstake queue for an account into a separate Subscription class.
• Abstract account balances to a new Subscription class.
• Add fetching and formatting of one BondedPool.
• Discontinue fetching pool member entries, no longer scalable.
• Migrate pool multi queries to classes.
• Move account proxies subscription to Account Proxies Subscription class.
• Migrate proxy queries to ProxyQuery class.
• init ActivePoolAccount subscription & remove multi role logic.
• Migrate IdentitiesController to pApi.
• Migrate validator entries queries.
• Add ParaSessionAccounts query to replace subscription.
• Add PoolMemberBatchEvent and migrate pool member batches.
• Migrate ValidatorEntries multi queries.
• Migrate ClaimedRewards, BondedMulti queries for Payouts.
• Migrate remaining Payouts queries.
• Refactor tx hooks for pApi support.
• Submit transactions via pApi.
• Remove useBuildPayload hook.
• Stop exposing api and peopleApi through API context.
• Stop connecting to PJS API.
• Uninstall PJS API dependencies.
• Added custom signer for Ledger.
• Ensure all queries and apis are fetched at best.
• Added custom signer for Polkadot Vault.
• Add custom signer for WalletConnect with amended submission flow.