SUBMARINE-1168. Add database initialization metadata with flyway

[cdmikechen]

What is this PR for?

Add a database initialization metadata service with flyway. When users use their own RDS service or database, submarine can automatically initialize the database.
Since no association usage has been found in the server-core/k8s package, only the submarine database has been initialized for the time being, and metastore and mlflow have not been processed.

What type of PR is it?

Feature

Todos

• - Add DatabaseMetadataService to init database metadata by flyway
• - Add a test case to init database on h2

What is the Jira issue?

https://issues.apache.org/jira/browse/SUBMARINE-1168

How should this be tested?

Have added a test case org.apache.submarine.server.database.TestInitDatabaseMetadata

Screenshots (if appropriate)

Questions:

• Do the license files need updating? No
• Are there breaking changes for older versions? No
• Does this need new documentation? No

[codecov]

Codecov Report

Merging #873 (db64bd9) into master (09a7e77) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #873   +/-   ##
=======================================
  Coverage   67.27%   67.27%           
=======================================
  Files         128      128           
  Lines        6224     6224           
=======================================
  Hits         4187     4187           
  Misses       2037     2037           

Flag	Coverage Δ
python-integration	54.20% <ø> (ø)
python-unit	48.00% <ø> (ø)

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