[YUNIKORN-1276] REST API for specific application

[manirajv06]

What is this PR for?

Exposed an REST API to fetch the specific application details.

What type of PR is it?

• [ ] - Improvement

Todos

• [ ] - Task

What is the Jira issue?

https://issues.apache.org/jira/browse/YUNIKORN-1276

How should this be tested?

Screenshots (if appropriate)

Questions:

• [ ] - The licenses files need update.
• [ ] - There is breaking changes for older versions.
• [ ] - It needs documentation.

[codecov[bot]]

Codecov Report

Merging #428 (09e3a40) into master (d74e728) will increase coverage by 0.47%. The diff coverage is 80.48%.

@@            Coverage Diff             @@
##           master     #428      +/-   ##
==========================================
+ Coverage   71.87%   72.34%   +0.47%     
==========================================
  Files          65       65              
  Lines        9602     9558      -44     
==========================================
+ Hits         6901     6915      +14     
+ Misses       2458     2405      -53     
+ Partials      243      238       -5     

Impacted Files	Coverage Δ
pkg/scheduler/objects/queue.go	69.90% <50.00%> (ø)
pkg/webservice/handlers.go	76.40% <81.57%> (+7.01%)	:arrow_up:
pkg/webservice/state_dump.go	79.33% <100.00%> (-0.67%)	:arrow_down:

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