[Enhancement](Backup) support show create repository

[GoGoWen]

Proposed changes

Issue Number: close #xxx

Problem summary

Describe your changes.

support show create repository stmt.

SQL example: show create repository for repo_name
Result:
MySQL [(none)]> show create repository for doris_backup_backup_cluster_bt1;
+---------------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| RepoName | CreateStmt |
+---------------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| doris_backup_backup_cluster_bt1 | create read only repository doris_backup_backup_cluster_bt1 with broker broker_name on location "hdfs://ns1017/user/jd_ad/ads_report/narwal_backup/backup_cluster" properties ("password" = "XXXX","dfs.client.failover.proxy.provider" = "org.apache.hadoop.hdfs.server.namenode.ha.ConfiguredFailoverProxyProvider","dfs.ha.namenodes.ns1017" = "nn1,nn2","dfs.namenode.rpc-address.ns1017.nn2" = "XXXXXX:8020","dfs.nameservices" = "ns1017","dfs.namenode.rpc-address.ns1017.nn1" = "XXXXX:8020","username" = "XXXX") |
+---------------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+

Checklist(Required)

• [N ] Does it affect the original behavior
• [ N] Has unit tests been added
• [N ] Has document been added or modified
• [N ] Does it need to update dependencies
• [Y] Is this PR support rollback (If NO, please explain WHY)

Further comments

If this is a relatively large or complex change, kick off the discussion at dev@doris.apache.org by explaining why you chose the solution you did and what alternatives you considered, etc...

[morningman]

run buildall

[morningman]

Need to use PrintableMap to print properties, to hide sensitive properties.

[GoGoWen]

Need to use PrintableMap to print properties, to hide sensitive properties.

Done

[morningman]

LGTM

[morningman]

run buildall

[github-actions]

PR approved by at least one committer and no changes requested.

[github-actions]

PR approved by anyone and no changes requested.

[hello-stephen]

TeamCity pipeline, clickbench performance test result:
the sum of best hot time: 33.54 seconds
stream load tsv: 427 seconds loaded 74807831229 Bytes, about 167 MB/s
stream load json: 21 seconds loaded 2358488459 Bytes, about 107 MB/s
stream load orc: 72 seconds loaded 1101869774 Bytes, about 14 MB/s
stream load parquet: 30 seconds loaded 861443392 Bytes, about 27 MB/s
https://doris-community-test-1308700295.cos.ap-hongkong.myqcloud.com/tmp/20230410045843_clickbench_pr_126765.html