Simplify filtering API

The filtering API of HDS can be simplified by removing the {type} and taking the /many behaviour as default. The efficiency effects should be considered.

• Get datasource with name:
  /registry/one/name/equals/home/bedroom/temperature
• Filter all datasources with prefix home in name:
  /registry/many/name/prefix/home
• Filter all datasources based on address meta field:
  /registry/many/meta.address/contains/Bonn

[LS-430] created by tavakoli

What about adding a limit query parameter?

• Get datasource with name:
  /registry/one/name/equals/home/bedroom/temperature?limit=1
• Filter all datasources with prefix home in name:
  /registry-/many-/name/prefix/home
• Filter all datasources based on address meta field:
  /registry/many/meta.address/contains/Bonn

by tavakoli