fix[tool]: fix layout export with nonreentrancy pragma on

[cyberthirst]

What I did

• address layout export with -f layout doesn't include the reentrancy lock #4612

How I did it

• included also getter definitions when iterating over functions during exports

Commit message

this commit fixes storage layout exports when pragma nonreentrancy is
on for getters (which were not being included in the layout).

How to verify it

• added relevant tests

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.50%. Comparing base (3a41220) to head (9d9b0f8).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #4621   +/-   ##
=======================================
  Coverage   92.49%   92.50%           
=======================================
  Files         128      128           
  Lines       18506    18510    +4     
  Branches     3208     3208           
=======================================
+ Hits        17118    17122    +4     
  Misses        944      944           
  Partials      444      444           

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[charles-cooper]

lgtm, @cyberthirst i added a single comment 9d9b0f8