gdb: split gdbarch component types to gdbarch_types.py

Editing gdbarch-components.py is not an experience in an editor that is
minimally smart about Python.  Because gdbarch-components.py is read and
exec'd by gdbarch.py, it doesn't import the  Info / Method / Function /
Value types.  And because these types are defined in gdbarch.py, it
can't import them, as that would make a cyclic dependency.

Solve this by introducing a third file, gdbarch_types.py, to define
these types.  Make gdbarch.py and gdbarch-components.py import it.
Also, replace the read & exec of gdbarch-components.py by a regular
import.  For this to work though, gdbarch-components.py needs to be
renamed to gdbarch_components.py.

Change-Id: Ibe994d56ef9efcc0698b3ca9670d4d9bf8bbb853
Reviewed-By: Tom Tromey <tom@tromey.com>
Reviewed-By: Andrew Burgess <aburgess@redhat.com>

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