feat: add toggle for password field visibility

[bntrtm]

Implements a password toggle to TextField components configured as passwords.
The changes are implemented by simply returning the appropriate fieldConfiguration properties pertinent to password visibility toggling as outlined by the MDUI documentation.

The feature, widespread on the web today, greatly improves user login experience. Without it, users are disincentivized from using stronger passwords, as some may opt for a shorter and/or simpler one to avoid the potential headache of re-entering the password should a typo occur in the process.

How was this PR tested?

• Ensured toggle hides password in TextField as expected
• Ensured login page password field features the toggle
• Ensured create page password field features the toggle

Screenshots & Screencasts (if appropriate)

These two screenshots show only the signup page, but it works all the same on the login page.

Checklist:

• I have carefully read the contributing guidelines
• I have performed a self-review of my own code
• I have made corresponding changes to the documentation if applicable
• I have no unrelated changes in the PR
• I have confirmed that any new dependencies are strictly necessary
• I have written tests for new code (if applicable)
• I have followed naming conventions/patterns in the surrounding code

Please declare, if any, LLM usage involved in creating this PR

None

[Pecacheu]

Looks good to me, using a feature already built into mdui. (Tho just to note, I believe we aren't merging any more PRs atm waiting on a release candidate)

[Dadadah]

Thanks for your contribution. Chu is correct, we will merge this after 0.8.0 is released.