DBAL-1264: [GH-881] Add Mysql per-column charset support

[doctrinebot]

Jira issue originally created by user @doctrinebot:

This issue is created automatically through a Github pull request on behalf of mRoca:

Url: #881

Message:

Actually with MySQL we can define a collation per column, but the charset seems not supported, whereas specified in the documentation : http://doctrine-dbal.readthedocs.org/en/latest/reference/schema-representation.html#vendor-specific-options

I've added the CHARACTER SET ***** sql declation for the MySQL platform.

Use case with Doctrine/ORM : @Column(name="foo", type="text", options={"collation"="utf8mb4*unicode*ci", "charset"="utf8mb4"})

Linked PR : #850

[doctrinebot]

Comment created by @doctrinebot:

A related Github Pull-Request [GH-881] was labeled:
#881

[doctrinebot]

Comment created by @doctrinebot:

A related Github Pull-Request [GH-881] was assigned:
#881

[github-actions]

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