fix(cmd/gno): pass an ExecContext to MachineOptions in gno run

[wyhaines]

This fixes: #2834

It tries to hew very closely to how the context is created under gno test so that there is consistency of results between code that is executed in the test and run contexts. Please let me know if there are any conventions for the codebase that I should have followed that I did not.

I hooked into the portion of the ExecRun() that was calling NewMachineWithOptions(), and instead followed a similar pattern to what is defined in test.go to configure the machine with a context that has reasonable defaults. These, except for the Chain ID (which is dev when running under gno test), are identical to the test settings.

This allows packages like gno.land/p/demo/entropy to work when code is executed with gno run, as well as any others which might try to access information only available from the context.

A simple piece of code to demonstrate the issue is below. This will fail without this change.

package foo

import (
  "fmt"
  "std"
)

func main() {
  fmt.Printf("GetHeight(): %d\n", std.GetHeight())
}

A test has been added to the tests for the run command, which tries to run code similar to the code above within the test.

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

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 60.95%. Comparing base (577c462) to head (54d976c).
Report is 8 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2856      +/-   ##
==========================================
+ Coverage   60.92%   60.95%   +0.02%     
==========================================
  Files         564      564              
  Lines       75267    75380     +113     
==========================================
+ Hits        45854    45945      +91     
- Misses      26041    26049       +8     
- Partials     3372     3386      +14     

Flag	Coverage Δ
contribs/gnodev	60.65% <ø> (-0.82%)	⬇️
contribs/gnofaucet	14.46% <ø> (ø)
gno.land	67.17% <ø> (ø)
gnovm	65.77% <100.00%> (+<0.01%)	⬆️
misc/genstd	80.54% <ø> (ø)
misc/logos	19.88% <ø> (-0.36%)	⬇️
tm2	62.10% <ø> (+<0.01%)	⬆️

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[moul]

would be nice to have the height so we can detect if it changes.