RefID to support garbage collection of objects

[RT-nilPointer]

Description

Keeps track of RefIDs for the detection of objects and updating of buckets.

The root of RefIDs is generated from a local secret, a malicious user with access to this secret can cause data loss.

Motivation and Context

Support the missing deletion of content on the backend.

How to test this PR?

Need the latest TemporalX backend with RefID support

[github-actions]

CLA Assistant Lite All Contributors have signed the CLA.

[codecov]

Codecov Report

Merging #100 (db87506) into master (64fd9b4) will increase coverage by 0.22%.
The diff coverage is 71.79%.

@@            Coverage Diff             @@
##           master     #100      +/-   ##
==========================================
+ Coverage   67.78%   68.01%   +0.22%     
==========================================
  Files          15       16       +1     
  Lines         950      991      +41     
==========================================
+ Hits          644      674      +30     
- Misses        201      206       +5     
- Partials      105      111       +6     

Impacted Files	Coverage Δ
gateway/s3x/bucket_locker.go	100.00% <ø> (ø)
gateway/s3x/refid.go	54.54% <54.54%> (ø)
gateway/s3x/ipfs.go	64.15% <88.88%> (+1.77%)	⬆️
gateway/s3x/ledger_bucket.go	74.54% <100.00%> (ø)
gateway/s3x/ledger_store.go	75.00% <100.00%> (+0.33%)	⬆️
gateway/s3x/multipart.go	55.04% <100.00%> (ø)
gateway/s3x/object.go	72.59% <100.00%> (ø)
gateway/s3x/s3x.go	69.23% <100.00%> (ø)
gateway/s3x/crdt_broadcaster.go	86.66% <0.00%> (+4.31%)	⬆️

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