[DataApi][Stage1] Deregistered operators endpt for LameDuck Operators

[siddimore]

Why are these changes needed?

Definition LameDuckOperator: Operator who was deregistered recently past 14 days as an example. Even if the Operator is DeRegistered their is responsibility to be available for the blobs they signed before DeRegisteration.
If that operator is offline, but is in the 14 day window they are termed as LameDuck Operator

1. Define Endpoint for DeRegisteredOperators Info
2. Create specific handler for Querying DeRegistered Operator in given time window
3. Update SubgraphClient to Get DeRegistered Operators in given time window
4. Check Operators returned by SubgraphClient to see if they are online
5. Create DeRegisteredMetadataResponse based on the result of Operator Online check

Sample Query

Query: GET "/v1/operatorsInfo/deregisteredOperators/?days=14"
Response: {"meta":{"size":2},"data":[{"operator_id":"0xe22dae12a0074f20b8fc96a0489376db34075e545ef60c4845d264a732568311","block_number":22,"ip_address":"localhost:32007","is_online":false},{"operator_id":"0xe23cae12a0074f20b8fc96a0489376db34075e545ef60c4845d264b732568312","block_number":24,"ip_address":"localhost:32009","is_online":true}]}

Stages

[Stage1][Current]: Implementation to query and check if DeRegistered Operators are online or not. A very simple check and provide a list
[Stage2]: Implementation to follow with block timestamp for last signed batch and possibly stats on how many days was operator offline for in the 14 day window.

Checks

• I've made sure the lint is passing in this PR.
• I've made sure the tests are passing. Note that there might be a few flaky tests, in that case, please comment that they are not relevant.
• Testing Strategy
  • Unit tests
  • Integration tests
  • This PR is not tested :(

[jianoaix]

You may want to generate swagger docs for this interface

[siddimore]

Note: Would like to merge this PR, if i can get an approval

[siddimore]

You may want to generate swagger docs for this interface

done

[dmanc]

lgtm, would be nice to put an example of the output in the description of the PR.

[siddimore]

lgtm, would be nice to put an example of the output in the description of the PR.

added