feat(sdk/vm)!: only allow using msgcall on realms

[thinhnx-var]

Contributors' checklist...

• Added new tests, or not needed, or not feasible
• Provided an example (e.g. screenshot) to aid review or the PR is self-explanatory
• Updated the official documentation or not needed
• No breaking changes were made, or a BREAKING CHANGE: xxx message was included in the description
• Added references to related issues and PRs
• Provided any useful hints for running manual tests
• Added new benchmarks to generated graphs, if any. More info here.

Follow discussion in #2192 and TheHowl's comment, this PR aims to prohibit the use of maketx call with a p/ entrypoint and force maketx call to call to a gno.land/ pkgpath

Behavior:

$ gnokey maketx call -broadcast -pkgpath gno.land/p/ -gas-wanted 10000000 -gas-fee 1000000ugnot -func Demo -remote localhost:26657 testKey

--= Error =--
Data: forbidden/bad package called
Msg Traces:
    0  ....... deliver transaction failed: log:
--= /Error =--

$ gnokey maketx call -broadcast -pkgpath gno.land/p -gas-wanted 10000000 -gas-fee 1000000ugnot -func Demo -remote localhost: 26657 testKey

--= Error =--
Data: forbidden/bad package called
Msg Traces:
    0  ....... deliver transaction failed: log:
--= /Error =--

For stdlibs, force the pkgpath to begins with gno.land/

$ gnokey maketx call -broadcast -pkgpath strconv -gas-wanted 10000000 -gas-fee 1000000ugnot -func Itoa -args 11 testKey

--= Error =--
Data: forbidden/bad package called
Msg Traces:
    0  ....... deliver transaction failed: log:
--= /Error =--

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 3 lines in your changes are missing coverage. Please review.

Project coverage is 54.62%. Comparing base (9c60a23) to head (2fbae1f).
Report is 1 commits behind head on master.

Files	Patch %	Lines
gno.land/pkg/sdk/vm/msgs.go	0.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2242      +/-   ##
==========================================
- Coverage   54.62%   54.62%   -0.01%     
==========================================
  Files         578      578              
  Lines       77808    77811       +3     
==========================================
+ Hits        42506    42507       +1     
- Misses      32132    32134       +2     
  Partials     3170     3170              

Flag	Coverage Δ
gno.land	61.64% <0.00%> (-0.03%)	⬇️
gnovm	59.98% <ø> (+<0.01%)	⬆️

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