iOS: expose onstart and beforetransition hook, create syncwaterfall js backed hook

[nancywu1]

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📦 Published PR as canary version: 0.10.3--canary.582.19520

Try this version out locally by upgrading relevant packages to 0.10.3--canary.582.19520

[nancywu1]

/canary

[codecov]

Codecov Report

Attention: Patch coverage is 80.35714% with 22 lines in your changes missing coverage. Please review.

Project coverage is 89.71%. Comparing base (cfdf872) to head (7110539).
Report is 8 commits behind head on main.

Files with missing lines	Patch %	Lines
ios/core/Sources/Types/Hooks/Hook.swift	45.94%	20 Missing ⚠️
ios/core/Sources/Types/Core/FlowType.swift	83.33%	1 Missing ⚠️
ios/core/Tests/FlowStateTests.swift	98.36%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #582      +/-   ##
==========================================
- Coverage   89.75%   89.71%   -0.05%     
==========================================
  Files         331      332       +1     
  Lines       19836    19947     +111     
  Branches     1949     1949              
==========================================
+ Hits        17804    17895      +91     
- Misses       2018     2038      +20     
  Partials       14       14              

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