fix(sdk/vm): coerce MsgRun pkgpath to gno.land/r/$addr/run

[thehowl]

This is the path that is reserved, but right now the handler for MsgRun allows any path to be used. This PR enforces all run calls to happen here exclusively.

[codecov]

Codecov Report

Attention: 5 lines in your changes are missing coverage. Please review.

Comparison is base (f060eb3) 56.51% compared to head (f5d502a) 56.52%.
Report is 3 commits behind head on master.

Files	Patch %	Lines
gno.land/pkg/sdk/vm/msgs.go	25.00%	3 Missing ⚠️
gno.land/pkg/gnoclient/client_txs.go	0.00%	1 Missing ⚠️
gno.land/pkg/sdk/vm/keeper.go	83.33%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1645   +/-   ##
=======================================
  Coverage   56.51%   56.52%           
=======================================
  Files         439      439           
  Lines       66561    66567    +6     
=======================================
+ Hits        37619    37625    +6     
+ Misses      26021    26020    -1     
- Partials     2921     2922    +1     

Flag	Coverage Δ
go-1.21.x	∅ <ø> (∅)
misc	∅ <ø> (∅)
misc-_test.genstd	∅ <ø> (∅)

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