BucketType method to locally store bucketType in variable

[Tulsishah]

Description

Create BucketType() method to returns the type of bucket, allowing the use of a new API specifically designed for HNS buckets.

Link to the issue in case of a bug fix.

NA

Testing details

1. Manual - NA
2. Unit tests - Added
3. Integration tests - Automated

[ankitaluthra1]

just few nits, please fix those, rest looks good to me

[codecov]

Codecov Report

Attention: Patch coverage is 13.79310% with 25 lines in your changes are missing coverage. Please review.

Please upload report for BASE (master@4620898). Learn more about missing BASE report.

Files	Patch %	Lines
internal/storage/mock_bucket.go	0.00%	13 Missing ⚠️
internal/gcsx/prefix_bucket.go	0.00%	2 Missing ⚠️
internal/monitor/bucket.go	0.00%	2 Missing ⚠️
internal/ratelimit/throttled_bucket.go	0.00%	2 Missing ⚠️
internal/storage/caching/fast_stat_bucket.go	0.00%	2 Missing ⚠️
internal/storage/debug_bucket.go	0.00%	2 Missing ⚠️
internal/storage/fake/bucket.go	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##             master    #1896   +/-   ##
=========================================
  Coverage          ?   61.35%           
=========================================
  Files             ?      129           
  Lines             ?    12326           
  Branches          ?        0           
=========================================
  Hits              ?     7563           
  Misses            ?     4425           
  Partials          ?      338           

Flag	Coverage Δ
unittests	61.35% <13.79%> (?)

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