REST API: split msgpack API type AccountResourceModel into two

[cce]

Summary

Address code review feedback in #3652 (comment)

Also updates API swagger descriptions as per #3652 (comment)

Test Plan

Existing tests should pass

[codecov-commenter]

Codecov Report

Merging #3679 (b737a8f) into feature/unlimited-assets (305a0b0) will increase coverage by 1.69%.
The diff coverage is 71.50%.

@@                     Coverage Diff                      @@
##           feature/unlimited-assets    #3679      +/-   ##
============================================================
+ Coverage                     47.81%   49.51%   +1.69%     
============================================================
  Files                           375      389      +14     
  Lines                         63955    68382    +4427     
============================================================
+ Hits                          30583    33858    +3275     
- Misses                        29727    30793    +1066     
- Partials                       3645     3731      +86     

Impacted Files	Coverage Δ
agreement/abstractions.go	50.00% <ø> (ø)
cmd/goal/application.go	11.16% <0.00%> (-0.02%)	⬇️
cmd/goal/asset.go	16.66% <0.00%> (ø)
cmd/goal/interact.go	3.35% <0.00%> (-0.01%)	⬇️
cmd/tealdbg/cdtSession.go	67.87% <0.00%> (ø)
cmd/tealdbg/debugger.go	71.42% <0.00%> (-1.44%)	⬇️
compactcert/db.go	73.68% <ø> (ø)
compactcert/worker.go	90.00% <ø> (ø)
config/localTemplate.go	42.85% <0.00%> (-7.15%)	⬇️
crypto/digest.go	0.00% <0.00%> (ø)
... and 149 more

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[jasonpaulos]

Looks good, thanks for making the changes