Add KeyboardButtonPollTypeType enum

[JrooTJunior]

A new enum KeyboardButtonPollTypeType for KeyboardButtonPollTypeType.type field has bed added.

[github-actions]

✔️ Changelog found.

Thank you for adding a description of the changes

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (eeafe46) 100.00% compared to head (1e85083) 100.00%.

Additional details and impacted files

@@            Coverage Diff            @@
##           dev-3.x     #1398   +/-   ##
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  Coverage   100.00%   100.00%           
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  Files          410       411    +1     
  Lines        10603     10608    +5     
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+ Hits         10603     10608    +5     

Flag	Coverage Δ
unittests	100.00% <100.00%> (ø)

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Files	Coverage Δ
aiogram/enums/__init__.py	100.00% <100.00%> (ø)
aiogram/enums/keyboard_button_poll_type_type.py	100.00% <100.00%> (ø)

[SychO3]

It should be KeyboardButtonPollType,The name seems to be wrong

[JrooTJunior]

Object from the Bot API is named as KeyboardButtonPollType, but this pull request adds an enumeration of known poll types that can be passed into KeyboardButtonPollType.type field, so, the name of this enum is combination of object type name and field name - KeyboardButtonPollTypeType.

Names of the object should not be overlapped in the framework codebase.