Edit endpoint to get files metadata by keyword search

[din-mukhammed]

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:
• system_test:
• zboxcli:
• zwalletcli:
• Other: ...

[codecov-commenter]

Codecov Report

Merging #962 (df29533) into staging (0b59e49) will decrease coverage by 0.21%.
The diff coverage is 0.00%.

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@@             Coverage Diff             @@
##           staging     #962      +/-   ##
===========================================
- Coverage    26.18%   25.98%   -0.21%     
===========================================
  Files           76       76              
  Lines         7744     7806      +62     
===========================================
  Hits          2028     2028              
- Misses        5444     5506      +62     
  Partials       272      272              

Flag	Coverage Δ
Unit-Tests	25.98% <0.00%> (-0.21%)	⬇️

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

Impacted Files	Coverage Δ
code/go/0chain.net/blobbercore/handler/handler.go	61.71% <0.00%> (-0.79%)	⬇️
.../0chain.net/blobbercore/handler/storage_handler.go	21.81% <0.00%> (-1.47%)	⬇️
code/go/0chain.net/blobbercore/reference/ref.go	0.00% <0.00%> (ø)

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[dabasov]

lgtm