Support $match-case option for adblock filters

[antonok-edm]

Brave's default lists include several $match-case regex filters; the option should be supported by Brave Shields for better compatibility.

Test Plan:

Add the following to brave://settings/shields/filters:

/^https?:\/\/cdn\.[a-z]{4,6}\.xyz\/test\.json/$3p,match-case

Visit https://example.com, open the DevTools panel, and paste each of the following lines into the console:

await fetch('https://cdn.abcdef.xyz/test.json');

await fetch('https://cdn.abcdef.xyz/TEST.JSON');

Without the fix, both will produce a net::ERR_BLOCKED_BY_CLIENT error.

With the fix, the second script should instead produce a net::ERR_NAME_NOT_RESOLVED error.

[MadhaviSeelam]

Verification PASSED using

Brave | 1.49.90 Chromium: 110.0.5481.77 (Official Build) beta (64-bit)
-- | --
Revision | 65ed616c6e8ee3fe0ad64fe83796c020644d42af-refs/branch-heads/5481@{#839}
OS | Windows 11 Version 21H2 (Build 22000.1455)

1. Install 1.49.90
2. launch Brave
3. open a new-tab page
4. open brave://settings/shields/filters
5. add following in the Create custom filters text box
   • /^https?:\/\/cdn\.[a-z]{4,6}\.xyz\/test\.json/$3p,match-case
6. click Save Changes
7. visit https://example.com/ in a new tab
8. open the DevTools panel, and paste each of the following lines separately into the console:
   • await fetch('https://cdn.abcdef.xyz/test.json');
   • await fetch('https://cdn.abcdef.xyz/TEST.JSON');

Confirmed second script (await fetch('https://cdn.abcdef.xyz/TEST.JSON');) produced net::ERR_NAME_NOT_RESOLVED error.

before fix (1.48.158)	step 5-6	step 8a	step 8b

[stephendonner]

Verification IN-PROGRESS using

Brave	1.49.96 Chromium: 110.0.5481.77 (Official Build) beta (x86_64)
Revision	65ed616c6e8ee3fe0ad64fe83796c020644d42af-refs/branch-heads/5481@{#839}
OS	macOS Version 11.7.3 (Build 20G1116)

Steps:

1. installed 1.49.96
2. launched Brave
3. opened a new-tab page
4. opened brave://settings/shields/filters
5. added the following in the Create custom filters text box
   /^https?:\/\/cdn\.[a-z]{4,6}\.xyz\/test\.json/$3p,match-case
6. clicked Save changes
7. visit https://example.com/ in a new tab
8. open the DevTools panel, and paste each of the following lines separately into the console:
   await fetch('https://cdn.abcdef.xyz/test.json');
await fetch('https://cdn.abcdef.xyz/TEST.JSON');

Confirmed second script (await fetch('https://cdn.abcdef.xyz/TEST.JSON';) produced net::ERR_NAME_NOT_RESOLVED error.

steps 5-6	step 8a	step 8b

[LaurenWags]

Verified with

Brave	1.49.114 Chromium: 110.0.5481.177 (Official Build) beta (64-bit) 
Revision	f34f7ab2d4ca4ad498ef42aeba4f4eb2c1392d63-refs/branch-heads/5481@{#1239}
OS	Linux

Verified test plan from #28194 (comment).

Reproduced the issue using 1.48.171.

1.48.171	brave://settings/shields/filters	1.49.114

[GeetaSarvadnya]

Verification PASSED on Samsung Galaxy version 12 running Bravemonoarm64.apk_1.49.118

Verified test plan from #28194 (comment).

Reproduced the issue using 1.48.171.

1.48.171	brave://adblock	1.49.118