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Fix AlterField ignoring max_length changes in migrations (#2128)

The _alter_field method only checked for nullability, index, unique,
description, default and rename changes. It did not compare SQL_TYPE,
so changing max_length (e.g. VARCHAR(32) to VARCHAR(64)) produced no
migration SQL.

Add SQL type comparison to the base schema editor and update MySQL,
MSSQL, and Oracle overrides to emit the correct ALTER statements when
the column type changes.

Fixes #2120

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