Vcert

What's Changed
* Adds retire certificate functionality to TLSPDC and TLSPC. Contributed by Pmaraveyias
* fix(ruamel): upgrades ruamel version on setup.py to 0.18.5

Fixes an issue whereby requesting a certificate in VaaS to a Certificate Issuing Template that uses Entrust CA throws an error.
Under some conditions Entrust CA may take too long to issue certificate, which causes VaaS to send 201 Created response with no `certifcateIds`. This is expected behavior and requires the sdk to poll for the certificate request until the status is `ISSUED` or `FAILED`

- Upgraded ruamel.yaml dependency to 0.18.5
- Added certificateType: AUTO to TPP certificate requests (courtesy of Pmaraveyias)

- Fixed https://github.com/Venafi/vcert-python/issues/124: Fixed an issue where adding a Certificate Issuing Template to an existing Application failed
- Upgraded cryptography dependency to 40.0.2 to cover a security risk CVE-2023-23931
- Removed orgUnit field from AppDetails, as Venafi as a Service dropped the use of the field

- Support for contacts/owners when creating a policy on both TPP and VaaS
- Support for legacy PKCS1 format on private keys when requesting a certificate
- Support for SANs: email, IP, URI when creating a policy on VaaS
- Ability to disable Subject fields on VaaS: organizations, org units, localities, states, countries
- Support for EC private keys on VaaS
- Support for Service generated related attributes on VaaS

- Dropped for support for Python 2 as it has reached end of life. New baseline is Python 3.6 and higher.
- Added integration with sonarcloud for test coverage.
- Added version history file.
- Added test cases for json/yaml file parsing.
- Minor issues fixed.