improve type hint for run_task and run_thread

[zrr1999]

Description

Optimized the type annotations for run_task and run_thread, ensuring that the user's function can still retain annotation information even after wrapping another layer of run_task or run_thread.

In addition, it also supports kwargs for run_thread.

Test Code

# Test code for the review of this PR

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Checklist:

• I signed the CLA.
• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• My changes generate no new warnings

• New and existing tests pass locally with my changes
• I have made corresponding changes to the documentation (if applicable)

Screenshots (if applicable):

->

Additional details

[sourcery-ai]

Reviewer's Guide by Sourcery

This pull request adds type hints to various methods in the flet_core/page.py file. The changes primarily involve specifying the types of function parameters and return values using Python's type hinting system. This helps in improving code readability and maintainability by making the expected types explicit.

File-Level Changes

Files	Changes
sdk/python/packages/flet-core/src/flet_core/page.py	Added type hints to methods and introduced new type variables for better type safety and code clarity.

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[sourcery-ai]

Hey @zrr1999 - I've reviewed your changes and they look great!

Here's what I looked at during the review

• 🟡 General issues: 6 issues found
• 🟢 Security: all looks good
• 🟢 Testing: all looks good
• 🟢 Complexity: all looks good

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