Improve communication of which websites are tested by OONI Probe

[aanorbel]

Fixes ooni/probe#1929 , ooni/probe#1935

Proposed Changes

• Added Support for android viewBinding.
• Add button to load websites (loadFromWebConnectivity) used in web_connectivity test in CustomWebsiteActivity.
• Fetch and display websites in webconnectivity when loadFromWebConnectivity button is clicked, making loadFromWebConnectivity invisible when successful.

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[hellais]

TODO:

• Verify if the maxRuntime is being respected when the full list is fetched from the backend and the test is started
• Tighten up the padding between the URL entries
• Fix the positioning of the delete button

[aanorbel]

• Tighten up the padding between the URL entries
• Fix the positioning of the delete button

[aanorbel]

Suggested change

	RunningActivity.runAsForegroundService(CustomWebsiteActivity.this, suite.asArray(), this::finish);
	// Condition below is only true if the `loadFromWebConnectivity` has been clicked.
	if (binding.loadFromWebConnectivity.getVisibility() == View.INVISIBLE) {
	suite.getTestList(preferenceManager)[0].setMax_runtime(preferenceManager.getMaxRuntime());
	}
	RunningActivity.runAsForegroundService(CustomWebsiteActivity.this, suite.asArray(), this::finish);

@hellais , what do you think about this.