[iOS] Merge all filter lists (including general ones) into one engine

[cuba]

Description:

The filter lists work better when they are merged into a single engine since some filter lists are designed to work with parent filter lists.

EDIT: This is not fully possible. However we can probably still achieve a part of this by doing the following

1. Keep the multiple engines. (But we can remove any cosmetic and script rules...only keep network rules. We can also remove any network rules we're sure block async javascript requests (i.e. xhr/async fetch)). This will only be used to determine stats for anything blocked by content blockers, so only the rules that get compiled into content blocking rules matter here. (Might not be done initially as it will likely lead to minor stats miscalculations)
2. Create a separate engine which contains all rules. This will be used for scriplets, cosmetic filters and any async network requests blocked by the request blocker script.

This requires the following Issues to be completed first:

1. [iOS] Use correct components for Adblock services #32799

Note: The network blocking will still not be combined if we do this. But we should get better results for cosmetic filter, script injection and some async network blocking rules. This will also allow us to add custom lists exceptions to test CF and scripts.

Additional Information

For this we need the raw text versions of the files to be exposed. This is done here: brave/brave-core-crx-packager#468

[antonok-edm]

Copying the text from brave/brave-ios#6624, for reference:

Shipping precompiled DATs is problematic for several reasons detailed in the corresponding brave-browser issue: #25363

The FilterListCatalogEntry struct in brave-core currently has component id and key fields for two components, one of which is labeled as iOS-specific. The iOS-specific component is the legacy precompiled DAT version; the other one serves plaintext lists. brave-ios should migrate to the plaintext list format for better compatibility going forwards.

See also the related brave-core PR accomplishing this: #25363

[kjozwiak]

Adding missing milestone labels as brave/brave-core#22127 (comment) was formatted incorrectly so the automation didn't move the issue into the correct milestone.

[Uni-verse]

Verified on iPhone 12 Pro running iOS 17.3.1 using version 1.66.80

Using Test Plan in PR brave/brave-core#22127 (comment):

• Ensured that ad-blocking works on https://youtube.com and other sites after upgrading.
• Ensured that ad-blocking works when loading videos on https://youtube.com after fresh install.
• Ensured that there are no issues with ad-block after engines are ready when relaunching app.
• Ensured ads are blocked using standard and aggressive settings.
• Ensured all test pages are passing mentioned in PR test plan.

Example	Example	Example	Example	Example

[Uni-verse]

Should be tested on iPad as well. Added QA/Test-All-Platforms label.