Unify stats across relevant pages

[ulyanas]

The task is to unify the implementation of stats across all relevant pages

Homepage

Counters and graphs

• Endpoint: /api/v1/pages/main
  Fetches counters and graphs data for the main page.

Transactions

Counters

• Endpoint: /api/v1/pages/transactions
  Provides transaction counters, including pending and daily transaction statistics.

Verified contracts

Counters

• Endpoint: /api/v1/pages/contracts
  Retrieves statistics for verified contracts, including new and total contracts.

Swagger

[bragov4ik]

Also built types as 2.4.0-alpha version of stats-types npm package

[bragov4ik]

Should have an option to switch between "operational transactions" and "regular transactions" charts on the frontend.
Stats service now always returns corresponding fields on the main page handle: https://stats-sepolia.k8s-dev.blockscout.com/api/v1/pages/main
It's possible that the arbitrum charts are disabled on the microservice, which will result in these fields being null:

    "total_operational_transactions": null,
    "yesterday_operational_transactions": null,
    ...
    "daily_new_operational_transactions": null

Also I published 2.4.0-beta npm package with stats types

[bragov4ik]

Consequently, the swagger was also updated