feat(nano): implement feature activation handling

[glevco]

Motivation

Implement the ability to use Feature Activation for Blocks for activating Nano Contracts.

Acceptance Criteria

• Update Nano feature activation to use block mechanism instead of transaction mechanism. This is compatible with testnet-hotel because it's less restrictive.
• Change nano config on mainnet from DISABLED to FEATURE_ACTIVATION. The feature config itself it not yet set.
• Refactor block consensus to initialize the feature activation block with an empty trie, while maintaining compatibility with previous code.
• On consensus, change _compute_vertices_that_became_invalid and related functions to methods.
• Add a nano activation mempool rule to remove invalid nano transactions.
• Refactor nano-related verification to use a verification param that is set
  • using the parent block for txs that come inside a block
  • using the best block for mempool txs.

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

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 85.97%. Comparing base (57f9bdc) to head (2a42f4c).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1410      +/-   ##
==========================================
+ Coverage   85.91%   85.97%   +0.05%     
==========================================
  Files         432      432              
  Lines       32791    32822      +31     
  Branches     5112     5114       +2     
==========================================
+ Hits        28174    28218      +44     
+ Misses       3599     3592       -7     
+ Partials     1018     1012       -6     

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The base branch was changed.