Add autocomplete support for API allowedValues

[dheeraj12347]

What does this PR do?

This PR adds support for using the allowedvalues metadata exposed by CloudStack API discovery to provide direct value autocompletion in CloudMonkey.

Changes

• Add AllowedValues to the APIArg struct.
• Parse the allowedvalues field from the API discovery response in UpdateCache().
• Use AllowedValues during autocompletion before falling back to the existing findAutocompleteAPI() heuristic.

Behavior

When a parameter exposes allowedvalues through API discovery, CloudMonkey now suggests those values directly.

For example:

create snapshotpolicy intervaltype=

Pressing TAB now suggests values such as:

HOURLY
DAILY
WEEKLY
MONTHLY

Parameters that do not expose allowedvalues continue to use the existing autocomplete behavior, so there is no behavioral change for parameters without this metadata.

Related

Builds on the API discovery changes introduced in apache/cloudstack#13543.

[DaanHoogland]

any rationale to add it in the middle?

[dheeraj12347]

any rationale to add it in the middle?

There wasn't a specific reason for placing it there. I grouped it near Related since both are populated from the API discovery response, but I can move AllowedValues to the end of the struct to keep the existing field ordering consistent if that's preferred.

[dheeraj12347]

any rationale to add it in the middle?

I've moved AllowedValues to the end of the APIArg struct to preserve the existing field ordering.

[github-actions]

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