Replace Nearblocks dependency in the indexer

[Tguntenaar]

Is your feature request related to a problem? Please describe.

Some proposals and proposal updates do not appear on the dashboard.

Our indexer relies on the Nearblocks API to track new transactions. However, since it depends on a specific Nearblocks endpoint, our dashboards went down when Nearblocks experienced issues.

According to the Nearblocks API documentation, the endpoint we are using is no longer recommended.

Describe the solution you'd like

We can track contract state changes for proposals and RFPs by implementing a FIFO queue-style changelog. This would allow our indexer to bypass Nearblocks and retrieve data directly from the contract.

Describe alternatives you've considered

We initially used Nearblocks as the source of truth, but it has proven unreliable.

Steps to take:

1. Deploy a new version of the contract
2. Deploy a new version of the indexer
3. Test if has all the proposals

[ori-near]

@Tguntenaar I believe this is not an issue within NEAR Treasury. If so, can we move it to the appropriate repo and project?

[Tguntenaar]

Update

Today we hit the nearblocks API rate limit of 20.000 calls a day. The tests of PR #18 aren't functional anymore for today. I will replace the api key so the tests can succeed and we can merge.