fix(android)!: access Context through webView.getContext() (CB-12623)

[dreifachstein]

Android WebView can be created without an Activity. One use case is
to create a WebView within a Service and attach/detach it to an
Activity window on demand.

[cordova-qa]

Cordova CI Build has completed successfully.

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66 tests run, 0 skipped, 0 failed.

[infil00p]

The CordovaWebView object is not actually an Android WebView, so this shouldn't be done.

[filmaj]

@infil00p should we close this?

[infil00p]

@filmaj Not sure. I'm not sure what the reporter is trying to do here.

[janpio]

@dreifachstein, could you elaborate please?

[jcesarmobile]

Looks good to me, but you'll have to update engines in package.json and plugin.xml to require cordova-android >= 7.0.0 as this is not available in older versions
apache/cordova-android@1790673

And we on next plugin update should do a major bump because of the engines update

[janpio]

Changes requested in #62 (comment)

[janpio]

Let there be tests.

We can bump the engines in a separate PR

[erisu]

I didn't see the engine requirement cordova-android >= 7.0.0 being added as requested.
Will we add it after this PR is merged?

[jcesarmobile]

yeah, we can add it in a separate PR