namada Remove delta map

Describe your changes

Extends #3142 by removing the unused delta_map. Also refactors/removes functions dealing with the balance keys.

Indicate on which release or other PRs this topic is based on

#3142 rebased on the tip ob base (diff for review: https://github.com/anoma/namada/pull/3172/files/2a25031ec579b802a0af75cff1ccbd08c8905c88..0ae083b7c347f2de353bc8b0dc1ee31baa1b3be6)

Checklist before merging to `draft`

[x] I have added a changelog
[x] Git history is in acceptable state

May 03 '24 14:05 grarco

Codecov Report

Attention: Patch coverage is 0% with 44 lines in your changes are missing coverage. Please review.

Project coverage is 59.76%. Comparing base (9d4de02) to head (0ae083b). Report is 12 commits behind head on main.

Files	Patch %	Lines
crates/sdk/src/masp.rs	0.00%	34 Missing :warning:
crates/core/src/masp.rs	0.00%	5 Missing :warning:
crates/apps/src/lib/bench_utils.rs	0.00%	1 Missing :warning:
crates/ibc/src/actions.rs	0.00%	1 Missing :warning:
crates/namada/src/ledger/native_vp/ibc/context.rs	0.00%	1 Missing :warning:
crates/shielded_token/src/storage_key.rs	0.00%	1 Missing :warning:
crates/tx_prelude/src/ibc.rs	0.00%	1 Missing :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3172      +/-   ##
==========================================
+ Coverage   59.40%   59.76%   +0.36%     
==========================================
  Files         298      298              
  Lines       92326    91769     -557     
==========================================
  Hits        54849    54849              
+ Misses      37477    36920     -557

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