[KYUUBI #337] [FOLLOWUP]GetSchemas supports DSv2 multipart namespaces with dot backtick
 [](https://github.com/yaooqinn/kyuubi/pull/337)      [❨?❩](https://pullrequestbadge.com/?utm_medium=github&utm_source=yaooqinn&utm_campaign=badge_info)<!-- PR-BADGE: PLEASE DO NOT REMOVE THIS COMMENT -->
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### _Why are the changes needed?_
<!--
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1. If you add a feature, you can talk about the use case of it.
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add support for '.' and '`' in a namespace part
for instance, cases like https://github.com/yaooqinn/kyuubi/pull/337/files#diff-bcd0dfb958c3943a58a9705ac7053374c796449fefd6be7e9f014f9dd14b558fR94 produce the below catalog tree, we should treat `a.b`.c and a.`b.c` differently.
```
/var/folders/01/h81cs4sn3dq2dd_k4j6fhrmc0000gn/T/kyuubi-94c946f7-a64b-4980-9dd1-a63a573244dd
├── a
│ └── b.c
├── a.b
│ └── c
├── a.b.c
├── a.b`.c
├── db1
│ └── db2
│ └── db3
└── db4
```
### _How was this patch tested?_
- [x] Add some test cases that check the changes thoroughly including negative and positive cases if possible
- [x] Add screenshots for manual tests if appropriate
- [x] [Run test](https://kyuubi.readthedocs.io/en/latest/tools/testing.html#running-tests) locally before make a pull request
Closes #337 from yaooqinn/getschema3.
fdb8b19 [Kent Yao] [FOLLOWUP]GetSchemas supports DSv2 multipart namespaces
0091cfc [Kent Yao] [FOLLOWUP]GetSchemas supports DSv2 multipart namespaces
5ccee06 [Kent Yao] [FOLLOWUP]GetSchemas supports DSv2 multipart namespaces
Authored-by: Kent Yao <yao@apache.org>
Signed-off-by: Kent Yao <yao@apache.org>
a4d507a9c6