What is the purpose of the change

(For example: Streamis-Server defines the restful interfaces of Streamis, we can use linkis-httpclient to access it. Related issues: #50. )

Brief change log

(for example:)

• Define the the restful interfaces of Streamis;
• Define the service and dao interfaces of Streamis.

Verifying this change

(Please pick either of the following options)
This change is a trivial rework / code cleanup without any test coverage.
(or)
This change is already covered by existing tests, such as (please describe tests).
(or)
This change added tests and can be verified as follows:
(example:)

• Added tests for creating and execute the Streamis jobs and verify the availability of different Streamis Job, such as flinkSQL, Jar.

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

• Dependencies (does it add or upgrade a dependency): (yes / no)
• Anything that affects deployment: (yes / no / don't know)
• The Core framework, i.e., JobManager, Server.: (yes / no)

Documentation

• Does this pull request introduce a new feature? (yes / no)
• If yes, how is the feature documented? (not applicable / docs / JavaDocs / not documented)