feat(cache): dynamodb implementation

[chofnar]

What type of PR is this?

enhancement

Which issue does this PR fix:

Part of #564

What does this PR do / Why do we need it:

Added AWS DynamoDB driver.

Will this break upgrades or downgrades?

If a client uses DynamoDB and decides to downgrade, they must make sure that the database is migrated to BoltDB to avoid data loss.

New validations that might break stuff:
local storage driver, but explicit RemoteCache=true, this is not valid, so error out
remote storage driver, but no "cacheDriver" config section, error out

Defaults:
local storage driver -> RemoteCache=false
remote storage driver (s3) -> RemoteCache=true

Does this PR introduce any user-facing change?:

Adds the possibility to use AWS DynamoDB instead of BoltDB

Problems

• need to specify protocol in front of dynamodb endpoint (known issue)

To do

• fix lint problems
• remove comment from controller.go line 461
• fix misleading example config (local storage with remote cache, is invalid)
• check that the example config actually works
• add negative tests
• previous tests pass
• add coverage tests

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[codecov]

Codecov Report

Merging #953 (f9b575e) into main (94d073c) will not change coverage.
The diff coverage is n/a.

❗ Current head f9b575e differs from pull request most recent head ebb0c99. Consider uploading reports for the commit ebb0c99 to get more accurate results

@@           Coverage Diff           @@
##             main     #953   +/-   ##
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  Coverage   88.39%   88.39%           
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  Files          74       74           
  Lines       14128    14128           
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  Hits        12488    12488           
  Misses       1277     1277           
  Partials      363      363           

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[peusebiu]

let's add a new testCase in TestS3Dedupe https://github.com/project-zot/zot/blob/main/pkg/storage/s3/s3_test.go#L935

Currently TestS3Dedupe it's using boltdb, let's use both boltdb and DynamoDB, this should be a small change.

[rchincha]

Thanks for tracking your PR with task items, makes it easier to follow.