chore: modules optional with flags

[Shahroz16]

Note

Medium Risk
Build-time dependency selection now depends on reading android/gradle.properties or env vars, which could unexpectedly include/exclude the Location module depending on project layout and CI environment.

Overview
Makes the Location dependency opt-in for the iOS Swift Package by building targetDependencies dynamically instead of always linking it.

Adds logic in ios/customer_io/Package.swift to detect an enable flag from android/gradle.properties (walking up parent directories) with a fallback to CIO_LOCATION, and only appends Location when enabled.

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[github-actions]

Sample app builds 📱

Below you will find the list of the latest versions of the sample apps. It's recommended to always download the latest builds of the sample apps to accurately test the pull request.

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• flutter_sample_spm: 331.4.0 (29596557)

[mrehan27]

Ran some tests and it looks good 👍🏻