Add import/export APIs to migrate bucket metadata

[poornas]

Description

Motivation and Context

Allow ability to migrate bucket metadata for ease of administration

How to test this PR?

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Optimization (provides speedup with no functional changes)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• Fixes a regression (If yes, please add commit-id or PR # here)
• Documentation updated
• Unit tests added/updated

[klauspost]

Running lint check
cmd/admin-bucket-handlers.go:453: File is not `gofumpt`-ed (gofumpt)

[harshavardhana]

@poornas we made mc release for this but server-side change has not been merged - can this be rebased and made available for the next MinIO release?

[minio-trusted]

Mint Automation

Test	Result
mint-large-bucket.sh	✔️
mint-gateway-s3.sh	✔️
mint-dist-erasure.sh	✔️
mint-compress-encrypt-dist-erasure.sh	✔️
mint-pools.sh	✔️
mint-fs.sh	❌ more...
mint-erasure.sh	❌ more...

14929-234d717/mint-erasure.sh.log:

Running with
SERVER_ENDPOINT:      minio-k8s5:31169
ACCESS_KEY:           minio
SECRET_KEY:           ***REDACTED***
ENABLE_HTTPS:         0
SERVER_REGION:        us-east-1
MINT_DATA_DIR:        /mint/data
MINT_MODE:            full
ENABLE_VIRTUAL_STYLE: 0
RUN_ON_FAIL:          0

To get logs, run 'docker cp :/mint/log /tmp/mint-logs'

(1/15) Running aws-sdk-go tests ... done in 7 seconds
(2/15) Running aws-sdk-java tests ... done in 1 seconds
(3/15) Running aws-sdk-php tests ... done in 43 seconds
(4/15) Running aws-sdk-ruby tests ... done in 5 seconds
(5/15) Running awscli tests ... done in 56 seconds
(6/15) Running healthcheck tests ... done in 0 seconds
(7/15) Running mc tests ... done in 34 seconds
FAILED in 7 minutes and 34 seconds
Unhandled exception. System.AggregateException: One or more errors occurred. (A task was canceled.)
 ---> System.Threading.Tasks.TaskCanceledException: A task was canceled.
   at System.Threading.Tasks.Task.GetExceptions(Boolean includeTaskCanceledExceptions)
   at System.Threading.Tasks.Task.ThrowIfExceptional(Boolean includeTaskCanceledExceptions)
   at System.Threading.Tasks.Task.Wait(Int32 millisecondsTimeout, CancellationToken cancellationToken)
   at System.Threading.Tasks.Task.Wait()
   at Minio.Functional.Tests.Program.Main(String[] args) in /mint/run/core/minio-dotnet/temp/Minio.Functional.Tests/Program.cs:line 194
--- End of stack trace from previous location ---

   --- End of inner exception stack trace ---
   at System.Threading.Tasks.Task.ThrowIfExceptional(Boolean includeTaskCanceledExceptions)
   at System.Threading.Tasks.Task.Wait(Int32 millisecondsTimeout, CancellationToken cancellationToken)
   at System.Threading.Tasks.Task.Wait()
   at Minio.Functional.Tests.Program.Main(String[] args) in /mint/run/core/minio-dotnet/temp/Minio.Functional.Tests/Program.cs:line 194
(8/15) Running minio-go tests ... done in 55 seconds
(9/15) Running minio-java tests ... done in 19 seconds
(10/15) Running minio-js tests ... done in 59 seconds
(11/15) Running minio-py tests ... done in 50 seconds
(12/15) Running s3cmd tests ... done in 24 seconds
(13/15) Running s3select tests ... done in 1 seconds
(14/15) Running versioning tests ... done in 3 minutes and 2 seconds

Executed 14 out of 15 tests successfully.

14929-234d717/mint-fs.sh.log:

Running with
SERVER_ENDPOINT:      minio-k8s1:30961
ACCESS_KEY:           minio
SECRET_KEY:           ***REDACTED***
ENABLE_HTTPS:         0
SERVER_REGION:        us-east-1
MINT_DATA_DIR:        /mint/data
MINT_MODE:            full
ENABLE_VIRTUAL_STYLE: 0
RUN_ON_FAIL:          0

To get logs, run 'docker cp :/mint/log /tmp/mint-logs'

(1/15) Running aws-sdk-go tests ... done in 8 seconds
(2/15) Running aws-sdk-java tests ... done in 1 seconds
(3/15) Running aws-sdk-php tests ... done in 42 seconds
(4/15) Running aws-sdk-ruby tests ... done in 5 seconds
(5/15) Running awscli tests ... done in 53 seconds
(6/15) Running healthcheck tests ... done in 0 seconds
(7/15) Running mc tests ... done in 23 seconds
FAILED in 7 minutes and 47 seconds
Unhandled exception. System.AggregateException: One or more errors occurred. (A task was canceled.)
 ---> System.Threading.Tasks.TaskCanceledException: A task was canceled.
   at System.Threading.Tasks.Task.GetExceptions(Boolean includeTaskCanceledExceptions)
   at System.Threading.Tasks.Task.ThrowIfExceptional(Boolean includeTaskCanceledExceptions)
   at System.Threading.Tasks.Task.Wait(Int32 millisecondsTimeout, CancellationToken cancellationToken)
   at System.Threading.Tasks.Task.Wait()
   at Minio.Functional.Tests.Program.Main(String[] args) in /mint/run/core/minio-dotnet/temp/Minio.Functional.Tests/Program.cs:line 201
--- End of stack trace from previous location ---

   --- End of inner exception stack trace ---
   at System.Threading.Tasks.Task.ThrowIfExceptional(Boolean includeTaskCanceledExceptions)
   at System.Threading.Tasks.Task.Wait(Int32 millisecondsTimeout, CancellationToken cancellationToken)
   at System.Threading.Tasks.Task.Wait()
   at Minio.Functional.Tests.Program.Main(String[] args) in /mint/run/core/minio-dotnet/temp/Minio.Functional.Tests/Program.cs:line 201
(8/15) Running minio-go tests ... done in 1 minutes and 5 seconds
(9/15) Running minio-java tests ... done in 18 seconds
(10/15) Running minio-js tests ... done in 59 seconds
(11/15) Running minio-py tests ... done in 47 seconds
(12/15) Running s3cmd tests ... done in 23 seconds
(13/15) Running s3select tests ... done in 1 seconds
(14/15) Running versioning tests ... done in 3 minutes and 2 seconds

Executed 14 out of 15 tests successfully.

Deleting image on docker hub
Deleting image locally