feat(external_api) exposes more events from JS to native and adds the ability to send actions from native to JS.

Swift has a longstanding bug where a framework and a type cannot be named the
same. We have somehow managed to not run into this, but it now seems to be
hitting us.

Since this is a breaking change, this starts the road for SDK 3.0.

Weird timing issue in appDidFinishLaunching, make sure we store the
launchOptions before we touch any view code.

Use Fastlane to get them from Apple after processing, them upload them.

Also make sure WebRTC dSYMs are included when uploading.

Fixes: https://github.com/jitsi/jitsi-meet/issues/6665

The welcomePageEnabled and pictureInPictureEnabled props on mobile have been
converted to feature flags.

Inverts the icons to follow more what's in the phone app instead of
CallKit.

Time has come. We need to enable bitcode. It's optional for iOS targets, but
mandatory for the entire project if there is a watchOS target. Since we have a
watchOS target, it's time to enable it.

Co-authored-by: Pawel Domas <pawel.domas@jitsi.org>

- handle some weird bug
(https://github.com/firebase/firebase-ios-sdk/issues/233)
- use a common function to extract the URL off a dynamic link

The SDK will now search for an asset called "CallKitIcon" on the main bundle,
and fallback to a built-in asset it it's not there, allowing SDK users to
customize it by just adding asset with that name.

It complicates automated builds.

Signing wouldn't work, disabling it and enabling it again created these changes.
Oh well!

Consolidate all failure cases into a single one: CONFERENCE_TERMINATED. If the
conference ended gracefully no error indicator will be present, otherwise there
will be.