Optimize isValidPath check in MetadataStore

[Jason918]

Motivation

1. There is a logic error in original LocalMemoryMetadataStore#isValidPath with this code line 239

return !path.equals("/") || !path.endsWith("/");

The "||" operator should be "&&", to forbids path ends with "/"

2. Further more, as we can implement other MetadataStore based on etcd or other external storage system. The path check function should be added to AbstractMetadataStore, and get checked before any operations.

Modifications

1. Fixed the logic error in isValidPath and moved it to AbstractMetadataStore.
2. Check path before each operation in AbstractMetadataStore.
3. Add MetadataStoreException.InvalidPathException

Verifying this change

• Make sure that the change passes the CI checks.

This change added tests and can be verified as follows:

• org.apache.pulsar.metadata.LocalMemoryMetadataStoreTest#testPathValid

Does this pull request potentially affect one of the following parts:

If yes was chosen, please highlight the changes

• Dependencies (does it add or upgrade a dependency): (no)
• The public API: (no)
• The schema: (no)
• The default values of configurations: (no)
• The wire protocol: (no)
• The rest endpoints: (no)
• The admin cli options: (no)
• Anything that affects deployment: (no)

Documentation

Check the box below and label this PR (if you have committer privilege).

Need to update docs?

• doc

Added doc in isValidPath
No user doc needed.

[Jason918]

/pulsarbot run-failure-checks

[Jason918]

/pulsarbot run-failure-checks