[#426] feat(build): Assembling the Graviton distribution as tar.gz file

[xunliu]

What changes were proposed in this pull request?

Modify val assembleDistribution by registering(Tar::class) gradle task.

Why are the changes needed?

Currently, When you execting ./gradlew assembleDistribution command, will assemble the Graviton as a tar file, and when you untar it, The doesn't uncompress into graviton-<version> directory.

Fix: #426

Does this PR introduce any user-facing change?

N/A

How was this patch tested?

% ls -lt distribution 
graviton-0.2.0-SNAPSHOT
graviton-0.2.0-SNAPSHOT.tar.gz.sha256
graviton-0.2.0-SNAPSHOT.tar.gz
package
ls -lt distribution/graviton-0.2.0-SNAPSHOT
drwxr-xr-x   4 liuxun  staff   128 Sep 20 20:21 bin
drwxr-xr-x   5 liuxun  staff   160 Sep 20 20:21 conf
drwxr-xr-x   4 liuxun  staff   128 Sep 20 20:21 catalogs
drwxr-xr-x  75 liuxun  staff  2400 Sep 20 20:21 libs

[github-actions]

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