Add Microsoft JDK and Temurin JDK feeds

[Copilot]

Adds 0install feed files for Microsoft Build of OpenJDK and Eclipse Temurin JDK, following the existing java/openjdk.* pattern.

Microsoft Build of OpenJDK (java/microsoft-jdk.*)

• .xml — Main feed, no implementations, commands for Linux x64/aarch64, macOS x64/aarch64, Windows x64/aarch64
• .xml.template — Templated implementations using {version}, download URLs via https://aka.ms/download-jdk/microsoft-jdk-{version}-{os}-{arch}.{ext}
• .watch.py — Scrapes https://learn.microsoft.com/en-us/java/openjdk/download, extracts versions from download link patterns

Eclipse Temurin JDK (java/temurin-jdk.*)

• .xml — Main feed, no implementations, same platform coverage
• .xml.template — Templated implementations using {version}, {build}, {major}, pointing at adoptium/temurin{major}-binaries GitHub releases
• .watch.py — Queries Adoptium API (/v3/info/available_releases → /v3/assets/latest/{n}/hotspot) to discover all available versions with build numbers

Both feeds declare <feed-for interface="https://apps.0install.net/java/jdk.xml"/> so they're discoverable as JDK providers.

Watch script output examples

# microsoft-jdk.watch.py
{'version': '11.0.30'}, {'version': '17.0.18'}, {'version': '21.0.10'}, {'version': '25.0.2'}

# temurin-jdk.watch.py
{'version': '21.0.10', 'build': '7', 'major': '21'}, {'version': '25.0.2', 'build': '10', 'major': '25'}, ...

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