feat: add r/grc20reg

[moul]

Continues #1072
Related #1275, #1262
Depends on #1257
Depends on #2551

[codecov]

Codecov Report

Attention: Patch coverage is 63.15789% with 7 lines in your changes missing coverage. Please review.

Project coverage is 58.81%. Comparing base (9897b66) to head (aaa5922).

Files with missing lines	Patch %	Lines
gnovm/pkg/gnolang/machine.go	63.15%	6 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2516      +/-   ##
==========================================
- Coverage   60.87%   58.81%   -2.06%     
==========================================
  Files         563      560       -3     
  Lines       75193    74731     -462     
==========================================
- Hits        45770    43955    -1815     
- Misses      26055    27459    +1404     
+ Partials     3368     3317      -51     

Flag	Coverage Δ
contribs/gnodev	61.46% <ø> (ø)
contribs/gnofaucet	14.46% <ø> (-0.86%)	⬇️
misc/genstd	80.54% <ø> (ø)
misc/logos	20.23% <ø> (ø)
tm2	62.07% <ø> (-0.02%)	⬇️

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[moul]

Blocked by #2743

[r3v4s]

First of all, I know that this pr is sill working in progress, but couldn't wait for charming of supporting multiple grc20 tokens by default in gno-eco system(in this case grc20reg) and did some test.

Currently, grc20reg takes object from other realm to register it, and it seems like affects stack-frame. (tested with _test.gno)

On the other hand, testing with txtar slightly returns different result, cannot modify external-realm or non-realm object.
Is this due to #2743 you mentioned blocked by ??

[moul]

Yes, this grc20reg is no longer a work in progress, but it depends on the changes in the PR, specifically those in #2743.

For a preview of fully working examples, you can check my meta PR #2551, which includes some VM fixes, this completed realm, and other realms that use it, such as the atomicswap realm, for instance.