Add a `[pulse]` built-in effect to RichTextLabel

In games, blinking text is one of the more frequently used animations.
It can be (sparingly) used to bring attention to important messages
in a chat log or inventory tooltip, for instance.

This effect accepts the following options:

- `freq`: How fast text blinks (higher is faster).
- `color`: The target color multiplier for blinking.
  The default mostly fades out text, but not entirely (for better accessibility).
- `ease`: The easing function exponent to use.
  Negative values provide in-out easing, which is why `-2.0` is the default.

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