Building Bookkeeper with gradle on Java11

[pradeepbn]

Descriptions of the changes in this PR:

• This PR adds on top of ISSUE #2640: BP-43 Migrate to gradle all other tests #2812
• The main intent of this PR Building Bookkeeper with gradle on Java11 #2814 is to make sure bookkeeper with gradle builds on java11

Motivation

(Explain: why you're making that change, what is the problem you're trying to solve)

Changes

(Describe: what changes you have made)

Master Issue: #

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In order to uphold a high standard for quality for code contributions, Apache BookKeeper runs various precommit
checks for pull requests. A pull request can only be merged when it passes precommit checks.

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Be sure to do all of the following to help us incorporate your contribution
quickly and easily:

If this PR is a BookKeeper Proposal (BP):

• Make sure the PR title is formatted like:
  <BP-#>: Description of bookkeeper proposal
e.g. BP-1: 64 bits ledger is support
• Attach the master issue link in the description of this PR.
• Attach the google doc link if the BP is written in Google Doc.

Otherwise:

• Make sure the PR title is formatted like:
  <Issue #>: Description of pull request
e.g. Issue 123: Description ...
• Make sure tests pass via mvn clean apache-rat:check install spotbugs:check.
• Replace <Issue #> in the title with the actual Issue number.

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[mauricebarnum]

fwiw, gradle has first class support for JNI headers now. i didn't check the version, and i don't know gradle well enough yet to update the dependencies for the shared objects.

https://docs.gradle.org/current/dsl/org.gradle.api.tasks.compile.CompileOptions.html#org.gradle.api.tasks.compile.CompileOptions:headerOutputDirectory

[pradeepbn]

Yes, totally agree @mauricebarnum and made relevant changes in another PR #2817. I will close this PR since this is based on @pkumar-singh PR #2812 and want to keep it independent of #2812 changes.