nydusify: introduce chunkdict generate subcommand

[newthifans]

Notice

Please take a look and give me some code suggestions in the commit, thanks!

Brief introduction

Add the function of storing multiple nydus images into the database for generating chunkdict
Implement the command “nydusify chunkdict generate --sources”
by invoking the command “nydus-image chunkdict save --bootstrap” .

Basic usage

nydusify chunkdict generate --sources localhost:5000/ubuntu:nydus_latest,localhost:5000/ubuntu:nydus_latest_v1

Details

1. Write command “nydusify chunkdict generate” entries
2. Create a “chunkdict/generator” folder to implement the function
3. Store the image in the registry with slices and Store them in the database in turn
4. Parse nydus image and create a directory to hold corresponding bootstrap
5. Pull nydus image bootstrap and store corresponding directory
6. Invoke the command “nydus-image chunkdict save --bootstrap”

This PR is related to #1305

[anolis-bot]

@newthifans , a new test job has been submitted. Please wait in patience. The test job url: https://tone.openanolis.cn/ws/nrh4nnio/test_result/82102

[codecov]

Codecov Report

Merging #1341 (a1759b7) into master (662117a) will decrease coverage by 0.02%.
The diff coverage is n/a.

❗ Current head a1759b7 differs from pull request most recent head 54364ac. Consider uploading reports for the commit 54364ac to get more accurate results

@@            Coverage Diff             @@
##           master    #1341      +/-   ##
==========================================
- Coverage   45.71%   45.70%   -0.02%     
==========================================
  Files         123      123              
  Lines       37287    37287              
  Branches    37287    37287              
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- Hits        17047    17041       -6     
- Misses      19347    19348       +1     
- Partials      893      898       +5     

see 3 files with indirect coverage changes

[anolis-bot]

@newthifans , The CI test is completed, please check result:

Test Case		Test Result
build rust golang image		✅ SUCCESS
compile nydusd		✅ SUCCESS
compile ctr remote		✅ SUCCESS
compile nydus snapshotter		✅ SUCCESS
run container with rafs		✅ SUCCESS
run container with zran		✅ SUCCESS
run container with rafs and compile linux		✅ SUCCESS

Congratulations, your test job passed!

[anolis-bot]

@newthifans , the code has been updated, so a new test job has been submitted. Please wait in patience. The test job url: https://tone.openanolis.cn/ws/nrh4nnio/test_result/82344

[anolis-bot]

@newthifans , The CI test is completed, please check result:

Test Case		Test Result
build rust golang image		✅ SUCCESS
compile nydusd		✅ SUCCESS
compile ctr remote		✅ SUCCESS
compile nydus snapshotter		✅ SUCCESS
run container with rafs		✅ SUCCESS
run container with zran		✅ SUCCESS
run container with rafs and compile linux		✅ SUCCESS

Congratulations, your test job passed!

[anolis-bot]

@newthifans , the code has been updated, so a new test job has been submitted. Please wait in patience. The test job url: https://tone.openanolis.cn/ws/nrh4nnio/test_result/84027

[anolis-bot]

@newthifans , The CI test is completed, please check result:

Test Case		Test Result
build rust golang image		✅ SUCCESS
compile nydusd		✅ SUCCESS
compile ctr remote		✅ SUCCESS
compile nydus snapshotter		✅ SUCCESS
run container with rafs		✅ SUCCESS
run container with zran		✅ SUCCESS
run container with rafs and compile linux		✅ SUCCESS

Congratulations, your test job passed!