fix: change column type of oxDocument.document

[iromli]

When using MySQL, this is how oxDocument.document column described:

mysql> show columns in oxDocument where Field = 'document';
+----------+-------------+------+-----+---------+-------+
| Field    | Type        | Null | Key | Default | Extra |
+----------+-------------+------+-----+---------+-------+
| document | varchar(64) | YES  |     | NULL    |       |
+----------+-------------+------+-----+---------+-------+

Unfortunately, varchar(64) is not sufficient for oxDocument.document as this column may holds big string, i.e. SAML metadata.

To reproduce the issue:

1. deploy Gluu Server
2. in oxTrust UI, go to JSON Configuration > Store Provider Configuration, and select DB in Document store Type dropdown.
3. restart oxTrust
4. add Trust Relationship

5. check error in oxTrust logs

   Caught MysqlDataTruncation for insert into gluu.oxDocument (creationDate, description, displayName, document, inum, oxEnabled, oxModuleProperty, objectClass, dn, doc_id)

[devrimyatar]

I looked sample metadata, it's length is more than 4.5K, so it will be TEXT type