[Feature] Add .NET 10 target framework to net client NuGet package

[softlion]

Original Content

net9 is out of support for maui. Provide a net10 client - it can be built in the same nuget.

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Description
Add .NET 10 target framework moniker (TFM) support to the net client library.

Motivation
.NET 9 is out of support for MAUI. The net client should provide a .NET 10 build to support current MAUI development.

Proposed Solution
Build and distribute a net10 target framework version alongside existing frameworks in the same NuGet package.

Additional Context

• Affected framework: MAUI
• .NET 9 support status: End of life
• Distribution: Single NuGet package with multiple TFM support

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🤖 Formatted by gitdog.dev

[hyochan]

Checked and fixed in PR #184: #184

Gitdog only reformatted the request here; the actual fix adds net10 shared, Android, iOS, and macCatalyst TFMs to the MAUI package and updates CI/release validation so the single NuGet builds both net9 and net10 targets.

[hyochan]

Deployed the final MAUI fix in OpenIap.Maui 1.1.3.

• Follow-up fix PR: fix(apple): accept apple purchase props #185
• GitHub Release: https://github.com/hyodotdev/openiap/releases/tag/maui-iap-1.1.3
• NuGet: https://www.nuget.org/packages/OpenIap.Maui/1.1.3

This includes the PR #184 MAUI net10 / Android packaging work and the PR #185 iOS purchase-sheet fix. The iOS MAUI bridge now accepts the canonical apple purchase/subscription props while preserving the legacy ios fallback, so MAUI iOS purchase requests can resolve the SKU and present the StoreKit purchase sheet.