Add new search param to refine mapping type filter

[willemarcel]

The search param /api/v2/projects/?mappingTypes=BUILDINGS right now returns projects whose mapping type field contains buildings, but includes projects set with buildings and other types.

Add a new search param that would filter projects strictly, so in the case mentioned above it would return projects whose mapping type is only BUILDINGS

[d-rita]

@willemarcel, To add to this functionality, what should happen when a person selects multiple mapping types? Should the result include projects with all mapping types or any of them? For example, should the search query /api/v2/projects/?mappingTypes=BUILDINGS,ROADS return projects strictly with both types, or can the search results include projects with any and both types?

[willemarcel]

@d-rita On the backend, I propose to add a new search param, it could be named mappingTypesExact to receive a true / false value. The default would be false and would make mappingTypes work as it is now. If it is true, would switch to the exact match.

Then on the frontend we can add a switch.

@ramyaragupathy what do you think?

[ramyaragupathy]

@willemarcel - Yes that sounds right - so it will be,
https://tasking-manager-tm4-production-api.hotosm.org/api/v2/projects/?mappingTypes=ROADS&mappingTypesExact=true

It would be nice to have these two as interdependent parameters, so that it mappingTypesExact becomes required only if mappingTypes is specified. I am checking out options in flask framework for this implementation, @willemarcel - if you're already aware of this, please add.

[willemarcel]

@ramyaragupathy I think it's not required to do that check, only assure that mappingTypesExact would have any effect if it's alone. If it's not present, the default value is false.