Introduce PutBlobOptions in router API

[cgtz]

This will allow request options to be passed into the Router::putBlob
method. In contrast to the BlobProperties, which are persisted with
the blob in storage, PutBlobOptions only influence the router logic.

For now, the options object is empty, but will soon include some options
required for data chunk upload.

[codecov-io]

Codecov Report

Merging #983 into master will increase coverage by 0.04%.
The diff coverage is 88.88%.

@@             Coverage Diff              @@
##             master     #983      +/-   ##
============================================
+ Coverage     67.82%   67.87%   +0.04%     
- Complexity     4537     4541       +4     
============================================
  Files           372      374       +2     
  Lines         29300    29305       +5     
  Branches       3709     3709              
============================================
+ Hits          19873    19891      +18     
+ Misses         8392     8381      -11     
+ Partials       1035     1033       -2

Impacted Files	Coverage Δ	Complexity Δ
.../java/com.github.ambry/router/RouterErrorCode.java	100% <ø> (ø)	1 <0> (ø)	⬇️
...ava/com.github.ambry.router/NonBlockingRouter.java	82.24% <ø> (ø)	40 <0> (ø)	⬇️
...github.ambry.frontend/AmbryBlobStorageService.java	92.71% <ø> (ø)	39 <0> (ø)	⬇️
...ava/com.github.ambry.frontend/PostBlobHandler.java	92.5% <ø> (ø)	5 <0> (ø)	⬇️
...a/com.github.ambry/tools/perf/rest/PerfRouter.java	0% <ø> (ø)	0 <0> (ø)	⬇️
...in/java/com.github.ambry/router/CallbackUtils.java	66.66% <ø> (ø)	1 <0> (ø)	⬇️
....github.ambry/tools/admin/ConcurrencyTestTool.java	0% <0%> (ø)	0 <0> (ø)	⬇️
...n/java/com.github.ambry/router/PutBlobOptions.java	100% <100%> (ø)	2 <2> (?)
...ava/com.github.ambry.frontend/FrontendMetrics.java	100% <100%> (ø)	1 <0> (ø)	⬇️
...com.github.ambry/router/PutBlobOptionsBuilder.java	100% <100%> (ø)	2 <2> (?)
... and 9 more

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