[Feature]: Automatically set --from flag if one key in keyring

[julienrbrt]

Summary

The --from flag is mandatory for each tx command unless set as a positional argument.
AutoCLI has access to the keyring and uses it for resolving key names in commands.

We can improve the UX of AutoCLI commands, and automatically set the --from flag if there is only one key in the keyring.
This would avoid to always need to specify the --from flag.

ref: #17913 (comment)

Problem Definition

No response

Proposed Feature

Automatically set --from flag if one key in keyring in AutoCLI.

We should check if this works well and is not annoying with a keyring with a password.

[anilcse]

Sounds good. How about also allowing users to configure default if they have multiple?

[julienrbrt]

Sounds good. How about also allowing users to configure default if they have multiple?

I like this idea better tbh 👍🏾, this way it works with AutoCLI and for normal commands directly and avoids the keyring lookup.