iOS: add plugin manager

[nancywu1]

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📦 Published PR as canary version: 0.10.4--canary.603.20726

Try this version out locally by upgrading relevant packages to 0.10.4--canary.603.20726

[codecov]

Codecov Report

❌ Patch coverage is 96.15385% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 89.78%. Comparing base (d2cd181) to head (8bb6f6a).
⚠️ Report is 372 commits behind head on main.

Files with missing lines	Patch %	Lines
ios/core/Sources/PluginManager.swift	96.55%	1 Missing ⚠️
...lugins/metrics/swiftui/Sources/MetricsPlugin.swift	90.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #603   +/-   ##
=======================================
  Coverage   89.77%   89.78%           
=======================================
  Files         331      332    +1     
  Lines       19904    19943   +39     
  Branches     1949     1949           
=======================================
+ Hits        17869    17906   +37     
- Misses       2021     2024    +3     
+ Partials       14       13    -1     

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[nancywu1]

/canary