feat(gnokey): add missing -send flag to maketx run

[tbruyelle]

Closes #4866 Required for #4655

Added a txtar test to ensure that -send flag doesnt affect the user balance when used in maketx run.

Added similar txtar for maketx call, this time the user balance is affected.

[Gno2D2]

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Codecov Report

:x: Patch coverage is 80.00000% with 2 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
gno.land/pkg/keyscli/run.go	80.00%	1 Missing and 1 partial :warning:

:loudspeaker: Thoughts on this report? Let us know!

[moul]

The way I see it:

An ephemeral package is not a realm - it's code executing on behalf of the user. So OriginSend in this context doesn't behave like it does for other realms.

With a typical realm call, a user sends tokens to a contract. Here, -send specifies a spending cap, and the ephemeral code decides how to use it.

In other words, -send could theoretically be optional if we allowed the source code to directly use the caller's banker module, but that would be very unsafe. It's better to require an explicit -send flag which isn't actually "sending to another realm" but rather "providing a max spending allowance." for this script.

I think of it like the banker module having a virtual amount=0 when -send is omitted, and up to the -send value when provided.