[TIMOB-18851] Implement the filtering of analytics events for iOS

[pec1985]

PR follows #6921

https://jira.appcelerator.org/browse/TIMOB-18851

[cheekiatng]

Was trying to test and realised ti.geo is never fired anyway, both with and without the new code. have to remove 'static' here, otherwise analyticsSend will always be set to YES.

[pec1985]

I don't know why that's there, it was there already. Let me do some research and find out

[lokeshchdhry]

PR Approved
Tested using the custom 4.1.0 build given by @pec1985 .
As of now only ti.geo events are filtered by using Ti.Analytics.filterEvents(['ti.geo']) in the app.
Checked the following:

1. We get ti.geo events with out the filterEvents method -- Passed. We got ti.geo as expected.
2. We get ti.geo events with the filterEvents method -- Passed. We did not get ti.geo which is expected as they are filtered.
3. Any other events other than ti.geo are filtered -- Passed. No other events are filtered apart from ti.geo.

[cheekiatng]

Approved! Merging.