Remove unused TypeProvider methods

Remove unused TypeProvider methods

There are three methods related to source code, which are no longer
used by anyone:
- getConstructorPropertyName(SchemaNode node);
- getParamNameFromType(TypeDefinition<?> type);
- getTypeDefaultConstruction(LeafSchemaNode node);

These were useful for Config Subsystem a long time ago, but since its
removal they have no users. Their implementation is a rather big chunk
of unused code, which is a pure maintenance burden. Remove them.

Change-Id: Ic6419b0f65c9575dc593a3c32d01b53edffb8530
Signed-off-by: Robert Varga <robert.varga@pantheon.tech>