Add project type filter to projects view

[ofr1tz]

Is your feature request related to a problem? Please describe.
Currently, the app is configured to provide filters on requestingOrganisation and region for the projects listed on the projects view. The configuration can be adapted to filter on any attribute of the project entry on Firebase. As a contributor, I might want to filter on project type to select projects of the type (find, validate, compare) that I like most/feel most comfortable with.

Describe the solution you'd like
Add a filter for project type to the projects view. Filter item labels should be "Find", "Validate", "Compare" etc. As the projectType attribute of the project entry in Firebase is of type integer, labels/names need to be imported from projectTypes

Additional context
Refers #9