Add cursor size for text input

[mrkprdo]

I am working on textinput for small screens, while i am using textinput font size 15, the cursor is not following the size.
Hence added an option to declare cursor size.

[codecov]

Codecov Report

Merging #314 (bc798a0) into master (94c7d50) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #314   +/-   ##
=======================================
  Coverage   94.67%   94.68%           
=======================================
  Files          45       45           
  Lines       10614    10623    +9     
=======================================
+ Hits        10049    10058    +9     
  Misses        565      565           

Impacted Files	Coverage Δ
pygame_menu/_widgetmanager.py	97.82% <ø> (ø)
pygame_menu/widgets/widget/textinput.py	81.51% <100.00%> (+0.15%)	⬆️

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[ppizarror]

I've added some tests, and fixed some typing issues. Thanks :)

[ppizarror]

I was wondering why cursor_size must be in *args rather than **kwargs. As you can see, most of the **kwargs parameters modify the style of each widget

[mrkprdo]

I thought of that too. But considering in type_input class, most if not all cursor_* styling are in args.
If you think this as otherwise, you can go ahead and change it. :)

[ppizarror]

yep, maybe in further versions of this gui the parameters could me moved to kwargs, anyway it does not break any compatibility,
thanks

[ppizarror]

the new version 4.0.2 will be published today

[mrkprdo]

Awesome. Thanks