add 'arcyon paste' to create pastes

Summary: Added a wrapper around the conduit API for phabricators paste function for this purpose.

Test Plan: See phlcon_paste__t

Reviewers: jevripio

Reviewed By: jevripio

CC: phab

Differential Revision: https://sibld.phab.dev.bloomberg.com/D159
Arcyd: un-decorate the mock methods

Make comparison of mock and real argspecs possible by removing the need
to decorate the methods of mocks with 'method_tracer'.

Instead, instrument the methods during __init__ with the new
phlsys_tracedecorator.decorate_object_methods

Test Plan: $ ./precommit.sh
Manually inspected trace output