Initial Code for OTN PCE (no merge conflict, no regression)

Create initial code for OTN PCE, starting from existing PCE, trying to reuse asfap the existing blocks, and respecting the approach followed for WDM PCE.
https://git.opendaylight.org/gerrit/c/transportpce/+/85363
_Rebase on latest version of the code
_No regression on WDM layer
_Adapt topology mangement to avoid regressions

Evaluation indicators:

• code published on master branch , not necessarily merged
• build + Junit OK, no new warnings, functional tests passed

• no merge conflict in Gerrit, code not necessarily merged
• confirmation that there is no regression published in Gerrit comments