Calculate hash on upload

[Hitenjain14]

Changes

Fixes

Tests

Tasks to complete before merging PR:

• Ensure system tests are passing. If not Run them manually to check for any regressions 📋
• Do any new system tests need added to test this change? do any existing system tests need updated? If so create a PR at 0chain/system_test
• Merge your system tests PR to master AFTER merging this PR

Associated PRs (Link as appropriate):

• 0chain:
• gosdk: Add shard size to formData gosdk#1175
• system_test:
• zboxcli:
• zwalletcli:
• Other: ...

[codecov-commenter]

Codecov Report

Merging #1217 (cc8193e) into sprint-1.10 (0a01870) will increase coverage by 0.08%.
The diff coverage is 37.03%.

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@@               Coverage Diff               @@
##           sprint-1.10    #1217      +/-   ##
===============================================
+ Coverage        25.45%   25.53%   +0.08%     
===============================================
  Files               83       83              
  Lines             9277     9353      +76     
===============================================
+ Hits              2361     2388      +27     
- Misses            6625     6668      +43     
- Partials           291      297       +6     

Flag	Coverage Δ
Unit-Tests	25.53% <37.03%> (+0.08%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files Changed	Coverage Δ
code/go/0chain.net/blobbercore/filestore/store.go	0.00% <ø> (ø)
...ain.net/blobbercore/handler/file_command_update.go	0.00% <0.00%> (ø)
.../go/0chain.net/blobbercore/writemarker/protocol.go	0.00% <0.00%> (ø)
...in.net/blobbercore/allocation/file_changer_base.go	45.23% <25.00%> (-2.14%)	⬇️
...ain.net/blobbercore/handler/file_command_upload.go	40.36% <36.00%> (-0.33%)	⬇️
...chain.net/blobbercore/filestore/tree_validation.go	78.57% <44.44%> (-0.74%)	⬇️
...ode/go/0chain.net/blobbercore/filestore/storage.go	39.25% <57.14%> (+0.18%)	⬆️
...go/0chain.net/blobbercore/allocation/connection.go	26.08% <66.66%> (+26.08%)	⬆️

[dabasov]

lgtm