[feat] tools-v2: add scan-state

[montaguelhz]

What problem does this PR solve?

Issue Number: #2360

Problem Summary:

support bs set scan command in [curve tool]

What is changed and how it works?

What's Changed:

1. add tools-v2/pkg/cli/command/curvebs/update/scan_state.go
2. modify tools-v2/pkg/cli/command/curvebs/update.go
3. modify tools-v2/pkg/config/bs.go
4. modify tools-v2/README.md

How it Works:

Usage:  curve bs update scan-state [flags]

enable/disable scan for logical pool

Flags:
  -c, --conf string            config file (default is $HOME/.curve/curve.yaml or /etc/curve/curve.yaml)
  -f, --format string          output format (json|plain) (default "plain")
  -h, --help                   print help
      --logicalpoolid uint32   logical pool id[required]
      --mdsaddr string         mds address, should be like 127.0.0.1:6700,127.0.0.1:6701,127.0.0.1:6702
      --rpcretrytimes int32    rpc retry times (default 1)
      --rpctimeout duration    rpc timeout (default 10s)
      --scan                   enable/disable scan for logical pool (default true)
      --showerror              display all errors in command
      --verbose                show some log

Examples:
$ curve bs update scan-state --logicalpoolid 1 [--scan=true/false]

command result

curve bs update scan-state --logicalpoolid 1 --scan=true
+----+------+---------+--------+
| ID | SCAN | RESULT  | REASON |
+----+------+---------+--------+
| 1  | true | success | null   |
+----+------+---------+--------+
curve bs update scan-state --logicalpoolid 2 --scan=false
+----+-------+--------+---------------------+
| ID | SCAN  | RESULT |       REASON        |
+----+-------+--------+---------------------+
| 2  | false | fail   | LogicalPoolNotFound |
+----+-------+--------+---------------------+

Side effects(Breaking backward compatibility? Performance regression?):

Check List

• Relevant documentation/comments is changed or added
• I acknowledge that all my contributions will be made under the project's license

[Cyber-SiKu]

Flag scan is required, will it be better?

[montaguelhz]

In my opinion, from the user's point of view, it is more intuitive for the scan flag to default to true. At the same time, reducing parameters can reduce the user's memory burden.

[Cyber-SiKu]

cicheck

[Cyber-SiKu]

Please merge your commits into one

[Cyber-SiKu]

cicheck