Refactor/static metadata

[glevco]

Motivation

What was the motivation for the changes in this PR?

Acceptance Criteria

• Include here all things that this PR should solve

Checklist

• If you are requesting a merge into master, confirm this code is production-ready and can be included in future releases as soon as it gets merged

[codecov]

Codecov Report

Attention: Patch coverage is 90.41096% with 28 lines in your changes are missing coverage. Please review.

Project coverage is 84.73%. Comparing base (e06d1d4) to head (cb4c721).

Files	Patch %	Lines
...tion/storage/migrations/migrate_static_metadata.py	41.66%	21 Missing ⚠️
hathor/transaction/storage/rocksdb_storage.py	80.00%	4 Missing ⚠️
hathor/mining/block_template.py	0.00%	1 Missing ⚠️
hathor/transaction/base_transaction.py	94.73%	0 Missing and 1 partial ⚠️
hathor/transaction/storage/cache_storage.py	91.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1012      +/-   ##
==========================================
- Coverage   84.99%   84.73%   -0.27%     
==========================================
  Files         298      300       +2     
  Lines       22952    23101     +149     
  Branches     3466     3503      +37     
==========================================
+ Hits        19509    19575      +66     
- Misses       2761     2852      +91     
+ Partials      682      674       -8     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[glevco]

Moved to PRs #1013 and #1014.