Synology chat add verify ssl

[bremor]

Description:

Added verify_ssl option into synology_chat to allow users to disable ssl verification for self signed certs or direct IP address in the url.

Related issue (if applicable): fixes # Not applicable

Pull request in home-assistant.io with documentation (if applicable): home-assistant/home-assistant.io#7833

Example entry for configuration.yaml (if applicable):

notify:
  - platform: synology_chat
    name: hass_synchat
    verify_ssl: True
    resource: https://example.your.synology.com/webapi/entry.cgi?api=SYNO.Chat.External&method=incoming&version=1&token=ABCDEFG

Checklist:

• The code change is tested and works locally.
• Local tests pass with tox. Your PR cannot be merged unless tests pass
• There is no commented out code in this PR.

If user exposed functionality or configuration variables are added/changed:

• Documentation added/updated in home-assistant.io

If the code communicates with devices, web services, or third-party tools:

• New dependencies have been added to the REQUIREMENTS variable (example).
• New dependencies are only imported inside functions that use them (example).
• New or updated dependencies have been added to requirements_all.txt by running script/gen_requirements_all.py.
• New files were added to .coveragerc.

If the code does not interact with devices:

• Tests have been added to verify that the new code works.

[fabaff]

Thanks 🐦