Refactor transportpce-routing-constraint model

Refactor transportpce-routing-constraint model

- extract enumeration pce-metric from transportpce-routing-constraints
to transportpce-common-service-path-type, and use it as
pce-routing-metric
- adapt code, UT and functional tests consequently
- update model revisions and imports in TPCE code

NB: this refactor is a preliminary step to replace the
transportpce-routing-constraints model by openroadm-routing-constraints
one (done in change
https://git.opendaylight.org/gerrit/c/transportpce/+/99380), and they
should be cherry-picked together to guarantee YANG revision dates
coherency.

JIRA: TRNSPRTPCE-586
Signed-off-by: Gilles Thouenon <gilles.thouenon@orange.com>
Change-Id: I93b26ee4e4b45fd06a6459010b115910a84aef68