Added fastnear as an alternative provider of NEAR blockchain data

[kobayurii]

This PR introduces fastnear as an alternative data provider to the NEAR Lake Framework. By integrating fastnear, we aim to provide a more flexible source for retrieving NEAR blockchain data, enhancing the overall versatility and performance of the framework.

Changes

• Extended the existing codebase to support fastnear as an additional data source.
• Added necessary configurations and documentation for enabling fastnear.
• Implemented mechanisms to switch seamlessly between NEAR Lake and fastnear providers based on user preference or use case.

Motivation

Adding fastnear as a source allows users to access NEAR blockchain data from a different provider, potentially benefiting from performance or cost improvements.

[kobayurii]

@race-of-sloths please, include my PR in the Race

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[khorolets]

Awesome PR that bring a great value to the users and contributes into a decentralization. Great job!

The only thing that is left is around the README, we need to add a section describing that now there is a couple of data providers the framework supports and clearly explain how to use both of them.

Also, we need to add the paragraph about the migration from the previous version even though it's a matter of adding .into().

After that we'll be more ready for merging except for the blocker we have (using the nearcore fork for the near-indexer-primitives crate)

[khorolets]

Reminder: this is the blocker from merging this change into the 0.7.x branch and releasing a new version

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