[FEATURE] Please allow the cursor color to be changed in the input field.

[kisskwon]

Is your feature request related to a problem? Please describe.
A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
-> I'm using your app very well. Thank you.
And I want to change primaryColor to white. but the cursor color in the input field is changed too.
I want to customize the cursor color in the input field.

Describe the solution you'd like
A clear and concise description of what you want to happen.
-> Add cursorColor field in LoginTheme.

Additional context
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