This commit shades the json API in the configuration processor so that
it doesn't bring `android-json` to the classpath anymore.

Closes gh-10307

Change `CacheMeterBinderProvider` to include a cache type
generic which helps to simplify implementations. Also move
and extract a few classes.

See gh-11221

Update the validator background initializer to actually create
the validator.

Closes gh-11412

This commit configures Jetty for HTTP/2 support as soon as the following
conditions are met:

* `server.http2.enabled=true`
* Both `org.eclipse.jetty:jetty-alpn-conscrypt-server` and
`org.eclipse.jetty.http2:http2-server` are on classpath

This will use the Conscrypt library for ALPN and TLS support using
native libraries shipped within the Conscrypt uber Jar. This does not
require a JVM agent or patching the JDK classes.

Closes gh-10902

See gh-11235

Closes gh-11221

Closes gh-11483

Closes gh-11482

Closes gh-11481

Closes gh-11480

Closes gh-11479

Closes gh-11478

Closes gh-11477

Closes gh-11476

Closes gh-11475

Closes gh-11474

Previously, the Docbook Maven plugin would generate an epub archive
with the majority of contents in OEBPS/, including content.opf, while
the META-INF/container.xml file reference to content.opf in the root
of the archive.

This commit overrides the epub.oebps.dir variable to move the content
into the root of the archive where it's expected to be. Implementing
this override highlighted that our customization stylesheet was not
being applied as the configuration property was incorrect (it was
epubCustomnization rather than the required epub3Customization). This
has been corrected along with a problem with missing images that
fixing it revealed.

Closes gh-11470

This version is compatible with JDK9 libraries; this is now required
since Jetty introduced a dependency on ASM 6.0 in gh-11469.

Closes gh-11469

Closes gh-11455

Closes gh-11459

* pr/11460:
  Fix typos

Closes gh-11460

Closes gh-11468

* pr/11451:
  Polish

Closes gh-11451

* pr/11450:
  Fix typos

Closes gh-11450