[GOBBLIN-1883] Multiple tokens in ProxiedFileSystem

[arjun4084346]

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-1883

Description

• Here are some details about my PR, including screenshots (if applicable):
  While creating a proxied file system, sometimes we need multiple tokens. e.g. when there exists multiple namenodes

Tests

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

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

Merging #3744 (99f0507) into master (69d7e0f) will decrease coverage by 0.08%.
The diff coverage is 0.00%.

@@             Coverage Diff              @@
##             master    #3744      +/-   ##
============================================
- Coverage     47.09%   47.02%   -0.08%     
+ Complexity    10877    10848      -29     
============================================
  Files          2147     2147              
  Lines         84859    84868       +9     
  Branches       9416     9417       +1     
============================================
- Hits          39968    39910      -58     
- Misses        41264    41326      +62     
- Partials       3627     3632       +5     

Files Changed	Coverage Δ
...rg/apache/gobblin/util/ProxiedFileSystemCache.java	0.00% <0.00%> (ø)
...rg/apache/gobblin/util/ProxiedFileSystemUtils.java	0.00% <0.00%> (ø)
...main/java/org/apache/gobblin/util/WriterUtils.java	44.96% <0.00%> (ø)

... and 22 files with indirect coverage changes

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