feat: IOS GameLoop addition

[zuziaka]

This PR adds iOS example project with a game loop.

Scripts for generating IPA file from iOS source code will be added in:
#1345

Support for game loop in Flank will be fully implemented in:
#1341

Test Plan

How do we know the code works?

.

Checklist

• Documented
• Unit tested

---

Bottom note: Flank doesn't support gameloop mode for iOS yet.
Flank requires xctestrun-file which doesn't exist in gameloop mode. #1341

[zuziaka]

@Sloox Added temporary bash scripts:

• export.sh - will generate IPA
• ftl.s - will run gcloud command
  You can verify the test project using them.

[github-actions]

Timestamp: 2020-11-24 15:44:22
Buildscan url for ubuntu-workflow run 381370388
https://gradle.com/s/idkk3ukjemvkw

[codecov-io]

Codecov Report

Merging #1325 (d73008a) into master (130e468) will decrease coverage by 0.02%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master    #1325      +/-   ##
============================================
- Coverage     77.83%   77.81%   -0.03%     
  Complexity      705      705              
============================================
  Files           244      244              
  Lines          4692     4692              
  Branches        901      901              
============================================
- Hits           3652     3651       -1     
  Misses          550      550              
- Partials        490      491       +1     

[adamfilipow92]

• When I try to run this test from Debug.kt Flank returns

Both of following options must be specified [test, xctestrun-file].

Process finished with exit code 2

• Blank line missing

[zuziaka]

@adamfilipow92 FTL with gameloop mode doesn't need xctestrun-file,
however Flank currently requires it. @Sloox will fix this in next a PR

[adamfilipow92]

Thanks! I try to run it on gcloud cli!

[Sloox]

@adamfilipow92 this wont work until @jan-gogo applies a fix that will come in #1341 . However #1341 is blocked until other tickets are closed (including this one.)

[adamfilipow92]

Tested on gcloud cli

gcloud alpha firebase test ios run \
 --type game-loop --app FlankGameLoopExample.ipa --scenario-numbers 1 \
 --device model=iphone11,version=13.6

Test pass

┌─────────┬───────────────────────────┬──────────────┐
│ OUTCOME │      TEST_AXIS_VALUE      │ TEST_DETAILS │
├─────────┼───────────────────────────┼──────────────┤
│ Passed  │ iphone11-13.6-en-portrait │ --           │
└─────────┴───────────────────────────┴──────────────┘