feat: added select control renderer for enums and oneOf

[mhorsche]

Added <mat-select> control for enum and oneOf types. Enable multi-selection for array type. Not sure if RankedTester ist properly defined, could need help with that.

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[CLAassistant]

All committers have signed the CLA.

[lucas-koehler]

Hi! Thanks for your PR :heart: We'll try to have a look soon!

[coveralls]

coverage: 84.678% (-0.1%) from 84.796% when pulling df3072a5a14d962173b543f8b9a770468d90f3fa on mhorsche:master into 9d3f706d4dfebcc7409e075a0622d1f50c2e1f3d on eclipsesource:master.