[META] Improve brave://settings with updates to order and placement of several new settings

[rebron]

Description

This issue describes changes to brave://settings that will re-order the sections, combine several sections, and define the placement for new settings.

• Move Privacy and Security section - Move security and privacy higher in brave://settings #16470
• Add usage ping setting, update crash reporting and P3A text - Add pref for disabling stats ping #16583 and Usage ping opt out doesn't work #16378
• Add Tor section - Move Tor settings to Privacy and security section (brave://settings/privacy) #16624
• Add setting for Search Tabs icon - Add setting to enable/disable search tabs button #16007
• Add setting for Tab hover cards - Add setting to enable/disable "tab hover cards"  #9906
• Add Speedreader setting Add a Show speedreader button in settings #11098
• Improve settings sidenav accessibility - brave://settings sidenav accessibility and Brave design system light/dark theming, icons, typography #13688
• Move brave://adblock to settings - move brave://adblock/ to brave://settings/shields #8838
• Place settings under proper section - Reorganize settings webui  brave-core#20160
• Update appearance section - Update brave://settings/appearance with section titles and better grouping #33128
• Improve Shields and Cookie settings UX - Update settings for Shields, and Privacy and security  #36859
• Add Accessibility section - Consider pulling in some options from Chromium's Accessibility settings page #15844
• Add Griffin setting - Add globally accessible A/B testing opt-out setting #36295

Expected Design:

Figma: https://www.figma.com/file/tLXWGCpNoiJxDZDdpfordj/?node-id=359%3A9749

Brave version (brave://version info)

Target version to complete tbd.

Version/Channel Information:

• Can you reproduce this issue with the current release? n/a
• Can you reproduce this issue with the beta channel? n/a
• Can you reproduce this issue with the nightly channel? n/a

Other Additional Information:

• Does the issue resolve itself when disabling Brave Shields? n/a
• Does the issue resolve itself when disabling Brave Rewards? n/a
• Is the issue reproducible on the latest version of Chrome? n/a

Miscellaneous Information: