Python: make input parameter optional

[joowon-dm-snu]

Motivation and Context

solve #2233

Description

Contribution Checklist

• The code builds clean without any errors or warnings
• The PR follows the SK Contribution Guidelines and the pre-submission formatting script raises no violations
• All unit tests pass, and I have added new tests where possible
• I didn't break anyone 😄

[shawncal]

@mkarle Can you review please?

[joowon-dm-snu]

@shawncal @mkarle

This change will help Planner works better as input was always inserted into prompt because Planner get function parameters by context.skills.get_functions_view() I found this while porting stepwise planner into python

Here's sample example

If this PR is merged,

[mkarle]

I ran unit and integration tests as well as some samples and notebooks and didn't notice any regression.

[shawncal]

@joowon-dm-snu: Your branch is locked, so we cannot rebase and merge. The failing tests you're seeing above are not related to your change -- if you grant repo admins permissions to change your PR branch, we can update and merge the PR. Thanks!

[joowon-dm-snu]

@shawncal
i made this PR in organization repo, coxwave/semantic-kernel and here is the issue

The organization repo doesn't allow selecting the "Allow edits from maintainers" option. I've already made three PRs in that repo, so is it okay if I temporarily invite two people(@mkarle, @awharrison-28) to the coxwave/semantic-kernel?

From now on, I'll probably proceed with my personal account.

[joowon-dm-snu]

@shawncal i made this PR in organization repo, coxwave/semantic-kernel and here is the issue

The organization repo doesn't allow selecting the "Allow edits from maintainers" option. I've already made three PRs in that repo, so is it okay if I temporarily invite two people(@mkarle, @awharrison-28) to the coxwave/semantic-kernel?

From now on, I'll probably proceed with my personal account.

@shawncal
I transfer repo to private. problem solved!