test csv data of ml_proposal table

(H2 insert example. )
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INSERT INTO ML_PROPOSAL
    SELECT * FROM CSVREAD('test/data/ml-proposal1.csv');
implements ML proposal list page in admin area
Implemented ml proposal show, judge, update.
Add check constraints for ml_proposal table.

* status -> new, accepted, rejected
* archive_type -> mailman, other
Merge pull request #33 from mzkrelx/feature/ml-proposal#1

Feature/ml proposal#1