Implement TextField.counter property

[ndonkoHenri]

Fixes #3656

Summary by Sourcery

This pull request adds a new counter property to the TextField and Dropdown components, allowing for the display of a counter control. The buildInputDecoration function has been updated to support this new property.

• New Features:
  • Introduced the counter property to the TextField and Dropdown components, allowing for the display of a counter control.
• Enhancements:
  • Updated the buildInputDecoration function to support the new counter property, enabling the inclusion of a counter control in the input decoration.

[sourcery-ai]

Reviewer's Guide by Sourcery

This pull request implements the TextField.counter property by adding support for a counter control in various components. The changes include filtering for counter controls, updating the buildInputDecoration function to handle the counter parameter, and adding the counter parameter to constructors and relevant methods in the Python SDK.

File-Level Changes

Files	Changes
packages/flet/lib/src/controls/dropdown.dart packages/flet/lib/src/controls/textfield.dart	Added counterControls to filter controls with the name 'counter' and updated buildInputDecoration calls to include the counter parameter.
sdk/python/packages/flet-core/src/flet_core/form_field_control.py sdk/python/packages/flet-core/src/flet_core/dropdown.py sdk/python/packages/flet-core/src/flet_core/textfield.py	Added counter parameter to constructors and updated methods to handle counter control.

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[sourcery-ai]

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

Here's what I looked at during the review

• 🟡 General issues: 7 issues found
• 🟢 Security: all looks good
• 🟢 Testing: all looks good
• 🟢 Complexity: all looks good
• 🟢 Documentation: all looks good

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