Add varchar limit detection as per PostgreSQL limits #302
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What did this pull request do?
Add handling for string length's that exceed 10485760 so that PostgreSQL won't complain about the field length.
Add tests to confirm change.
User Case Description
Enable PostgreSQL to store text fields that exceed 10485760 in length, which is the maximum length of a varchar as per https://www.postgresql.org/docs/current/datatype-character.html.
This is similar to MySQL and SQLServer where specific lengths trigger a difference in the used data type.