Gradle

This commit introduces the generation of a dependency

verification metadata file from the CLI. If the user

calls `--write-verification-metadata`, then an XML

file is generated (`gradle/verification-metadata.xml`).

This file will contain the checksums for all artifacts

required by a build, which includes:

- plugin artifacts

- jars and other artifacts requested via a `configuration`

- secondary artifacts (javadocs, classifiers, ...)

It does NOT include metadata of those artifacts (pom files,

ivy files, Gradle Module metadata).

It isn't required to resolve any configuration to get this

behavior: the build will automatically process all resolvable

configurations and _try_ to resolve them automatically. All

artifacts resolved during this process are going to be automatically

downloaded (if not already). Then SHA-1 and SHA-512 checksums

are computed for all those artifacts.

The current format is an XML file planned to support more than

just artifacts: module metadata AND signature information is

planned.

See #11398

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