Rework TypedRowInvocationHandler invocation path

Rework TypedRowInvocationHandler invocation path

Performing schema lookup/validation is something we usually do only
once for a particular schema and then we can freely perform invocation.

Introduce MethodDispatch{Invoker,Prototype} constructs. MethodDispatch
serves as a the result of reflective analysis of a particular access
class.

When TypedDatabaseSchema accesses that class, the MethodDispatch
is loaded from a global cache and is bound to the schema, resulting
in an Invoker map. That map is then used to dispatch InvocationHandler
requests to the appropriate logic.

Change-Id: Ic97751992fea97b01a6fcfd124edbe783bc86e1c
Signed-off-by: Robert Varga <robert.varga@pantheon.tech>