plumb some rent

[rob-solana]

Problem

rent is unimplemented

Summary of Changes

step 0:

• add rent_collector, which mods accounts at load() time
• updated load to run rent_collector
• set rent to zero for now
• Instruction* types -> Transaction* types
• use those types

Fixes #

[rob-solana]

@sakridge once this is in place, we'll have to decide whether you hash() accounts before or after I deduct rent...

[rob-solana]

missing from this PR is keeping track of CO rent collection, which, because CO store() is skipped, we don't actually get the rent "collected". I think that code belongs in collect_accounts_to_store()

[codecov]

Codecov Report

Merging #5610 into master will increase coverage by 0.1%.
The diff coverage is 83.6%.

@@           Coverage Diff            @@
##           master   #5610     +/-   ##
========================================
+ Coverage    76.2%   76.3%   +0.1%     
========================================
  Files         217     218      +1     
  Lines       41560   41632     +72     
========================================
+ Hits        31685   31788    +103     
+ Misses       9875    9844     -31