[Meta Issue] Speedreader v2.5

[rebron]

Description

This is a meta issue to track Speedreader v2.5 feature development.

Core:

• [x] Add text to speech for Windows
• [x] Add text to speech for macOS
• [ ] Add text to speech for Linux

Desktop UI:

• [x] Change "reader mode" to "speedreader mode" and existing speedreader mode to "always on" option
• [x] Update speedreader toggle to Always on UI
• [x] Update default column width to be more readable
• [x] Add time to read estimate
• [x] Add inline toolbar for options for themes, font, and text size
• [x] #31540
• [ ] Provide method for any page to enter into speedreader mode
• [ ] Add site list for Always show in Speedreader with ability to add and remove sites to the list

Android UI:

Design: https://www.figma.com/file/YHMNRL2XpZDOUe6n1Dw6K1/Reader-mode?node-id=2180%3A61903

[HudsonAfonso]

• [ ] Provide method for any page to enter into speedreader mode