[Android] Custom filter lists via settings

[timchilds]

Related issue: #26587 (ideally we do both at the same time)

Description

Currently users can add custom filter lists via settings on iOS and Desktop. This ticket is to bring over the same feature to Android.

iOS Filter Lists	iOS Add Custom Filter List

Requirements

• Android users are able to add custom filter lists via settings.
• The setting should live under Brave Shields & privacy, after the "prevent fingerprinting via language settings" toggle.

Design

If possible copy the iOS layout. If an Android-specific design is required then design is TBD.

cc @deeppandya @anthonypkeane

[deeppandya]

CC @tapanmodh for more context :
https://github.com/brave/brave-browser/assets/5146988/505f7ebb-259f-4abb-b89d-e39e7f7b1722

[tapanmodh]

thank you @deeppandya

[car12o]

indeed, this would be super to have on android.
currently, I have to switch browser in order to see some beach cams in my town.

[deeppandya]

indeed, this would be super to have on android.
currently, I have to switch browser in order to see some beach cams in my town.

@car12o we are currently looking into it and it would be merged into the nightly application soon. So please stay tuned.

[hffvld]

Verified on Pixel 7 using version(s):

Device/OS: Pixel 7 [panther_beta-user 14 UPB5.230623.009 release-keys]
Brave build: 1.59.93
Chromium: 117.0.5938.88 (Official Build) beta (64-bit) 
Revision: 77474ed80832bd2c90be4ebf993b6c2a43f662b0

Filed follow-up issue #33178 and #33180

STEPS:

1. Follow the steps from [Android] custom filter list settings brave-core#19499 (comment)

ACTUAL RESULTS:

• Verified that Content Filtering section is added to Brave Shields & privacy
• Verified that custom filter list can be added to the listes
• Verified that custom filter list can be disabled
• Verified that custom filter list can be removed
• Verified that the same custom filter list can't be added again (duplicates are not allowed)
• Verified that multiple custom filter lists can be added

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