chore: Bump v9 -> v10 references

[keelerm84]

Note

Introduces identify hook support and migrates CI/docs to v10 with updated toolchains and build logging.

• SDK hooks: Adds IdentifySeriesContext, IdentifySeriesData, and LDClientIdentifyHook; extends Hook protocol with beforeIdentify/afterIdentify; wraps identify paths via _identifyHooked in LDClient.
• Tests: Splits and adds specs for evaluation/identify hooks; adjusts tests for formatting and reliability (main-thread completion, request building assertions).
• Build/CI: Switches workflows to v10, upgrades runners to macOS 15 and Xcode 16.4/15.4, updates simulators; installs swiftlint/xcpretty; surfaces SwiftLint/Sourcery logs on failure; bumps Mint dependencies (SwiftLint@0.63.0, Sourcery@2.3.0).
• Xcode project: Includes new hook files; enhances SwiftLint/Sourcery run scripts to prefer system tools and write logs.
• Contract tests: Updates Package.swift to Swift tools 5.5 and .macOS(.v12).
• Docs: README badges and PR template updated to reference v10.

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