feat: examples of creating a signed url for a blob with generation

[dmitry-fa]

Fixes #37

[codecov]

Codecov Report

Merging #140 into master will decrease coverage by 0.19%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##             master     #140     +/-   ##
===========================================
- Coverage     63.77%   63.58%   -0.2%     
+ Complexity      540      539      -1     
===========================================
  Files            30       30             
  Lines          4745     4731     -14     
  Branches        456      426     -30     
===========================================
- Hits           3026     3008     -18     
- Misses         1564     1565      +1     
- Partials        155      158      +3

Impacted Files	Coverage Δ	Complexity Δ
...rc/main/java/com/google/cloud/storage/Storage.java	80.78% <ø> (ø)	0 <0> (ø)	⬇️
...e/src/main/java/com/google/cloud/storage/Blob.java	82.24% <ø> (-0.11%)	29 <0> (-1)
...in/java/com/google/cloud/storage/StorageBatch.java	88% <0%> (-4%)	13% <0%> (ø)
...gle/cloud/storage/testing/RemoteStorageHelper.java	61.98% <0%> (-3.06%)	9% <0%> (ø)
...main/java/com/google/cloud/storage/BucketInfo.java	80.85% <0%> (-0.2%)	84% <0%> (ø)
...ain/java/com/google/cloud/storage/StorageImpl.java	78.67% <0%> (-0.12%)	120% <0%> (ø)
...om/google/cloud/storage/spi/v1/HttpStorageRpc.java	1.64% <0%> (ø)	1% <0%> (ø)	⬇️

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[elharo]

Thanks!