feat: add burn_block_height to Rosetta endpoints

[zone117x]

Closes https://github.com/hirosystems/stacks-blockchain-api/issues/1972

Adds to the /rosetta/v1/block response:

{
  block: {
    metadata: {
      burn_block_height: <bitcoin_block_height>
    }
  }
}

And to the /rosetta/v1/network/status response:

{
  current_burn_block_height: <bitcoin_block_height>
}

[github-actions[bot]]

Vercel deployment URL: https://stacks-blockchain-jkt98xwot-blockstack.vercel.app :rocket:

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 72.37%. Comparing base (3e2d524) to head (3b68c38). Report is 1 commits behind head on develop.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop #1974 +/- ## =========================================== - Coverage 72.40% 72.37% -0.03% =========================================== Files 94 94 Lines 12572 12573 +1 Branches 2930 2872 -58 =========================================== - Hits 9103 9100 -3 - Misses 3306 3455 +149 + Partials 163 18 -145 ```

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.

[blockstack-devops]

:tada: This PR is included in version 7.11.0-beta.7 :tada:

The release is available on:

• npm package (@beta dist-tag)
• npm package (@beta dist-tag)
• GitHub release

Your semantic-release bot :package::rocket:

[blockstack-devops]

:tada: This PR is included in version 7.11.0 :tada:

The release is available on:

• npm package (@latest dist-tag)
• npm package (@latest dist-tag)
• GitHub release

Your semantic-release bot :package::rocket: