Implement unified adblock list catalog

[antonok-edm]

The adblock lists we use in Brave are organized here. We've served regional.json directly from the component updater for a fairly long time. More recently, the format of default.json was updated to match regional.json, allowing them to share codepaths.

The final step of this approach will be to merge the two catalogs together. We can use new fields in each entry to specify additional information about the lists. To begin with, that information is:

• should they be displayed in brave://settings/shields/filters as regional lists
• should they be enabled by default
• should first-party heuristics be applied to rules from the list

The benefit of this change will be the ability to add the following as well:

• what scriptlet permissions should be granted to rules from the list

See also

brave/adblock-resources#130
brave/brave-core-crx-packager#687

[LaurenWags]

Labeling as QA/Blocked for now, as it looks like this will be reverted via brave/brave-core#20459 which has been requested for uplift to 1.60.x.

Once reverted we can QA/No this one unless @kjozwiak @rebron think otherwise 👍🏻

[kjozwiak]

Labelling as QA/No and removing QA/Blocked now that the above has been reverted from master & 1.60.x via brave/brave-core#20442 & brave/brave-core#20459.