[GOBBLIN-1487] Add gridfs datanode gaas

[Will-Lo]

Dear Gobblin maintainers,

Please accept this PR. I understand that it will not be reviewed until I have checked off all the steps below!

JIRA

• My PR addresses the following Gobblin JIRA issues and references them in the PR title. For example, "[GOBBLIN-XXX] My Gobblin PR"
  • https://issues.apache.org/jira/browse/GOBBLIN-1487

Description

• Here are some details about my PR, including screenshots (if applicable):
  Adds GridFS as a recognized fs schema

Tests

• My PR adds the following unit tests OR does not need testing for this extremely good reason:

Commits

• My commits all reference JIRA issues in their subject lines, and I have squashed multiple commits if they address the same issue. In addition, my commits follow the guidelines from "How to write a good git commit message":
  1. Subject is separated from body by a blank line
  2. Subject is limited to 50 characters
  3. Subject does not end with a period
  4. Subject uses the imperative mood ("add", not "adding")
  5. Body wraps at 72 characters
  6. Body explains "what" and "why", not "how"

[codecov-commenter]

Codecov Report

❌ Patch coverage is 55.55556% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 46.40%. Comparing base (2407be6) to head (48232c5).
⚠️ Report is 774 commits behind head on master.

Files with missing lines	Patch %	Lines
...modules/flowgraph/datanodes/fs/GridFSDataNode.java	55.55%	2 Missing and 2 partials ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #3326      +/-   ##
============================================
- Coverage     46.41%   46.40%   -0.02%     
- Complexity    10004    10014      +10     
============================================
  Files          2031     2034       +3     
  Lines         79002    79069      +67     
  Branches       8834     8840       +6     
============================================
+ Hits          36668    36689      +21     
- Misses        38932    38973      +41     
- Partials       3402     3407       +5     

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[Will-Lo]

@aplex @jack-moseley @arjun4084346 @umustafi please take a look

[umustafi]

are the from and to the same because we are making a copy from hdfs to gridfs?

[Will-Lo]

it's just the local cluster path in this scenario, so it doesn't matter what the fs is as it gets accounted for later.