chore!: remove deprecated `/nft_events` endpoint

[rafaelcr]

Fixes #1325

[github-actions[bot]]

🚀 Deployed on https://deploy-preview-1329--stacks-blockchain-api.netlify.app

[codecov-commenter]

Codecov Report

Merging #1329 (6f0a436) into beta (35db939) will decrease coverage by 0.05%. The diff coverage is n/a.

@@            Coverage Diff             @@
##             beta    #1329      +/-   ##
==========================================
- Coverage   77.26%   77.21%   -0.06%     
==========================================
  Files         103      103              
  Lines       10102    10079      -23     
  Branches     2179     2175       -4     
==========================================
- Hits         7805     7782      -23     
  Misses       2186     2186              
  Partials      111      111              

Impacted Files	Coverage Δ
src/api/routes/address.ts	87.13% <ø> (-0.85%)	:arrow_down:
src/datastore/pg-store.ts	92.79% <ø> (-0.05%)	:arrow_down:

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[blockstack-devops]

:tada: This PR is included in version 6.0.0-beta.7 :tada:

The release is available on:

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

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[blockstack-devops]

:tada: This PR is included in version 6.0.0 :tada:

The release is available on:

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

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[blockstack-devops]

:tada: This PR is included in version 7.0.0-stacks-2.1.2 :tada:

The release is available on:

• npm package (@stacks-2.1 dist-tag)
• npm package (@stacks-2.1 dist-tag)
• GitHub release

Your semantic-release bot :package::rocket: