Feature - account_data_direct_mapping

[Lichtso]

Problem

account_data_direct_mapping has been feature gated already but was not keyed / part of the feature set.

Summary of Changes

Adds a key for account_data_direct_mapping.

[mergify]

The Firedancer team maintains a line-for-line reimplementation of the
native programs, and until native programs are moved to BPF, those
implementations must exactly match their Agave counterparts.
If this PR represents a change to a native program implementation (not
tests), please include a reviewer from the Firedancer team. And please
keep refactors to a minimum.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 80.64516% with 6 lines in your changes missing coverage. Please review.
✅ Project coverage is 83.0%. Comparing base (f88c890) to head (2873402).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##           master    #8153     +/-   ##
=========================================
- Coverage    83.0%    83.0%   -0.1%     
=========================================
  Files         826      826             
  Lines      362234   362318     +84     
=========================================
+ Hits       300790   300825     +35     
- Misses      61444    61493     +49     

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