Support SAS Token to access Azure Blob Storage

[morazow]

It makes it possible to use Azure Blob Store container SAS token when importing or exporting data to/from Exasol table. This is additional feature to previous Account Secret Key access usage.

Fixes #42.

[codecov]

Codecov Report

Merging #44 into master will decrease coverage by 0.59%.
The diff coverage is 71.42%.

@@            Coverage Diff            @@
##           master      #44     +/-   ##
=========================================
- Coverage   94.35%   93.76%   -0.6%     
=========================================
  Files          25       25             
  Lines         567      577     +10     
  Branches       66       66             
=========================================
+ Hits          535      541      +6     
- Misses         32       36      +4

Impacted Files	Coverage Δ
...main/scala/com/exasol/cloudetl/bucket/Bucket.scala	100% <100%> (ø)	⬆️
...a/com/exasol/cloudetl/bucket/AzureBlobBucket.scala	84% <69.23%> (-16%)	⬇️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update a2c3985...1c5f72f. Read the comment docs.