feat: add maven wrapper

[xli1996]

Description

Disscusion around adopt maven wrapper to speed up building ksql. Ksql build can be slow using default maven due to https://issues.apache.org/jira/browse/MRESOLVER-164. A customized maven https://github.com/confluentinc/maven/tree/maven-3-6-3-patch with -DversionFilter parameter help reduce that issue.

Testing done

Replace mvn with ./mvnw

Reviewer checklist

• Ensure docs are updated if necessary. (eg. if a user visible feature is being added or changed).
• Ensure relevant issues are linked (description should include text like "Fixes #")

I am also consider if versionFilter should be default true, but probably need more testing.

[ghost]

@confluentinc It looks like @xli1996 just signed our Contributor License Agreement. 👍

Always at your service,

clabot

[guozhangwang]

Thanks @xli1996 . I think it makes sense to add this wrapper until MRESOLVER-164 is resolved. LGTM!