Expose the camkes.ast module to template authors.
Expose the camkes.ast module to template authors.

This allows the template context to perform `isinstance` testing on variables
against AST types.

smaccm/camkes-tool,agacek/camkes-tool,agacek/camkes-tool,agacek/camkes-tool,smaccm/camkes-tool,smaccm/camkes-tool,smaccm/camkes-tool