hyprland/language: add tooltip-format support

[Chillzyg]

Adds tooltip support for the hyprland/language module so users can configure a tooltip with the same layout replacement fields used by the module format.

Example:

"hyprland/language": {
  "format": "Layout: {short}",
  "tooltip": true,
  "tooltip-format": "Layout: {long}"
}

The module keeps the existing behavior when tooltip-format is not configured by using the visible label text as the tooltip.

Verification:

• git diff --check

I could not run the full Waybar Meson build or clang-format locally because meson and clang-format are not installed in this workspace.

Closes #3693.

[EmteZogaf]

Duplicate of #5012