[MINOR] Fix apache-rat violations

[jfrazee]

This fixes a few apache-rat violations and adds exclusions for the GitHub PR template type stuff. Note there is already a general attribution for Twitter in the NOTICE so I don't think we need to add another.

 hudi-common/src/main/java/org/apache/hudi/common/util/ObjectSizeCalculator.java
 hudi-utilities/src/main/java/org/apache/hudi/utilities/exception/HoodieSnapshotExporterException.java
 hudi-utilities/src/test/java/org/apache/hudi/utilities/sources/TestInputBatch.java
.github/**

[codecov-io]

Codecov Report

Merging #1639 into master will increase coverage by 0.01%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master    #1639      +/-   ##
============================================
+ Coverage     16.71%   16.72%   +0.01%     
- Complexity      795      796       +1     
============================================
  Files           340      340              
  Lines         15030    15030              
  Branches       1499     1499              
============================================
+ Hits           2512     2514       +2     
+ Misses        12188    12186       -2     
  Partials        330      330              

Impacted Files	Coverage Δ	Complexity Δ
.../apache/hudi/common/util/ObjectSizeCalculator.java	77.61% <ø> (ø)	25.00 <0.00> (ø)
...apache/hudi/common/fs/HoodieWrapperFileSystem.java	22.69% <0.00%> (+0.70%)	29.00% <0.00%> (+1.00%)

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[bvaradar]

Thanks @jfrazee for fixing the rat violations. I looked around old emails and previous PRs which brought this change. I think it is enough to just mention the attribution in NOTICE file.

[bvaradar]

For the other classes, the underlying problem is that apache-rat was not enabled for hudi-utilities bundle

[bvaradar]

@jfrazee : Thanks a lot for your help in identifying and providing the fix. There is one more related change as part of this and I took the liberty to add the patch to this PR. If the tests goes fine, I will merge the combined changes.

[vinothchandar]

@bvaradar hudi-integ-test also does not list the rat plugin.. Might be good to add these to bundles as well, just in case. (our release script will catch all this.. however good to do upfront)

[smarthi]

+1 to merge

[bvaradar]

@vinothchandar : Added rat check to hudi-integ-test.