add support for text input suffix icons

[nicknickel]

Proposed changes

• Implements Add input suffix Dogfalo/materialize#2490 to have text input suffix icons.
  • That PR was issued under what appears to be an older version of the code so there isn't much that is similar between this PR and that one.

Screenshots (if appropriate) or codepen:

Types of changes

• Bug fix (non-breaking change which fixes an issue).
• New feature (non-breaking change which adds functionality).
• Breaking change (fix or feature that would cause existing functionality to change).

Checklist:

• I have read the CONTRIBUTING document.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.

[DanielRuf]

LGTM

[lelabo-m]

In this PR, only changes to styles have been made.
Tell me if I am wrong, but from what I observed, form.js should be updated to have the same behavior between prefix and suffix icons.
I am thinking about adding the active class to icons depending on the events happening.