Optimized page blob upload by skipping empty ranges

[zezha-msft]

No description provided.

[codecov-io]

Codecov Report

Merging #388 into dev will decrease coverage by 0.08%.
The diff coverage is 61.11%.

@@            Coverage Diff             @@
##              dev     #388      +/-   ##
==========================================
- Coverage   86.05%   85.96%   -0.09%     
==========================================
  Files          56       56              
  Lines        4359     4369      +10     
  Branches      464      467       +3     
==========================================
+ Hits         3751     3756       +5     
- Misses        461      463       +2     
- Partials      147      150       +3

Impacted Files	Coverage Δ
...storage-blob/azure/storage/blob/pageblobservice.py	91.12% <ø> (ø)	⬆️
...torage-blob/azure/storage/blob/_upload_chunking.py	71.48% <61.11%> (-0.85%)	⬇️

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