Support more schema collections in GetSchema

[bgrainger]

Connector/NET supports the following schema collections in MySqlConnection.GetSchema. MySqlConnector only supports the bolded entries.

• MetaDataCollections
• DataSourceInformation
• DataTypes
• Restrictions
• ReservedWords
• Databases
• Tables
• Columns
• Users
• Foreign Keys
• IndexColumns
• Indexes
• Foreign Key Columns
• UDF
• Views
• ViewColumns
• Procedure Parameters
• Procedures
• Triggers

Add support for additional schema collections that weren't implemented in #361.

[phillipc]

Look at my PR: I have implemented Foreign Keys-, IndexColumns-, Indexes- and Foreign Key Columns-Support