Intercept requests and add skeleton for malicious site detection

[CrisBarreiro]

Task/Issue URL: https://app.asana.com/0/1205008441501016/1207151848931035/f

Description

Adds logic to intercept requests using shouldOverrideUrlLoading and shouldInterceptRequest, when the request matches the following conditions

• Is for mainframe
• Is for iframe and the host loading it matches the webview host
• The same URL hasn't been already intercepted during the same page load (used to prevent the same URL being intercepted by the 2 webview callbacks)

Steps to test this PR

Feature 1

• Load a site and check you get Timber.tag("MaliciousSiteProtection").d("isMalicious $url") for all mainframe and iframe requests (only for internal builds).
• Check you should never get 2 instances of those logs for the exact same URL

UI changes

Before	After
!(Upload before screenshot)	(Upload after screenshot)

[CrisBarreiro]

• Add blocking algorithm (isMalicious) #5376 : 2 dependent PRs (#5406 , #5416 )
• Load and store embedded dataset #5370
• Intercept requests and add skeleton for malicious site detection #5369 👈 (View in Graphite)
• develop

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[cmonfortep]

Just testing the changes (haven't started the code review yet)

Sharing something I've found:

• when clicking any link in this URL https://www.yahoo.com/?guccounter=1, the url changes but I don't see it in the logs.
• After some normal browsing on a tab, testing back and forward navigation between sites, I don't see some URLs appearing, and that I can repro. (edit: actually I think this never works, and the urls I see is just some requests the site triggers)
• I think this one is fine but just fyi, in the logs I see http://domain.com and https://domain.com (just changing schema http -> https)

Friendly reminder about updating the description of the PR to include what's included and giving some context 🙏

[CrisBarreiro]

Just testing the changes (haven't started the code review yet)

Sharing something I've found:

* when clicking any link in this URL https://www.yahoo.com/?guccounter=1, the url changes but I don't see it  in the logs.

* After some normal browsing on a tab, testing back and forward navigation between sites, I don't see some URLs appearing, and that I can repro. (edit: actually I think this never works, and the urls I see is just some requests the site triggers)

* I think this one is fine but just fyi, in the logs I see http://domain.com and https://domain.com (just changing schema http -> https)

Friendly reminder about updating the description of the PR to include what's included and giving some context 🙏

Discussed over zoom, there are no requests to such pages when navigating to an article. Documented here

[cmonfortep]

LGTM

Suggested to remove the state from the singleton if we can do that.

[CrisBarreiro]

I need to check if moving requestInterceptor.onPageStarted(url) here has any unintended side-effect. This is because onPageStarted can be called several times when a page is loaded