chore(gnovm/gnofmt): Replace usage of ast.Object with ast.Ident In gnofmt

[notJoon]

Description

Removes the usage of the deprecated ast.Object type and replaces it with ast.Ident. Since ast.Ident contains name and location information, I think it would provide the information that needed in most cases.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 60.73%. Comparing base (11a5027) to head (991803f).
Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2546      +/-   ##
==========================================
- Coverage   60.92%   60.73%   -0.19%     
==========================================
  Files         564      564              
  Lines       75273    77633    +2360     
==========================================
+ Hits        45857    47153    +1296     
- Misses      26048    26984     +936     
- Partials     3368     3496     +128     

Flag	Coverage Δ
contribs/gnodev	61.46% <ø> (ø)
contribs/gnofaucet	15.31% <ø> (+0.85%)	⬆️
gno.land	67.17% <ø> (ø)
gnovm	65.77% <100.00%> (ø)
misc/genstd	80.54% <ø> (ø)
misc/logos	20.23% <ø> (ø)
tm2	61.94% <ø> (-0.15%)	⬇️

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[zivkovicmilos]

I checked the changes, it seems like a simple type swap that doesn't modify anything persistent 👍