Add extra information to Choice

[Gracecr]

This adds Choice.instruction.

Supports all prompts that use Choice.

I've only added support for Alternative Syntax, but am open to adding support for Classic syntax if you'd like.

Closes #55.

[Gracecr]

@kazhala hate to be a bother, but would you mind giving this PR a look when you get a chance?

[exastone]

@Gracecr this is a nice add.
While testing it out it seems that instruction is a required attribute despite it being marked optional?

i.e. if instruction isn't defined then you end up with a lengthy stack trace error ending in: TypeError: can only concatenate str (not "NoneType") to str

e.g. removing instruction attribute from the below example results the mentioned error.

from InquirerPy import inquirer
from InquirerPy.base.control import Choice

region = inquirer.select(
        message="Select regions:",
        choices=[
            Choice("ap-southeast-2", name="Sydney", instruction="Region in Australia"),
            Choice("ap-southeast-1", name="Singapore", instruction="Region in Southeast Asia"),
        ],
    ).execute()

Might be worth looking into?

[Gracecr]

Strange, I'm not getting the same error. I'm able to run your example code (minus the instruction's) without error:

from InquirerPy import inquirer
from InquirerPy.base.control import Choice

region = inquirer.select(
    message="Select regions:",
    choices=[
        Choice("ap-southeast-2", name="Sydney"),
        Choice("ap-southeast-1", name="Singapore"),
    ],
).execute()

I just tested with py3.7 and py3.10 on windows in CMD. If you don't mind posting your stack trace, perhaps that will help me resolve the issue.

[lt-mayonesa]

@kazhala any chance you could take a look into this? I find it really helpful