Support for _tag and _profile as search parameters in x-fhir-query expression

[gosso22]

Is your feature request related to a problem? Please describe.
Currently, it is not possible to use _tag or _profile with x-fhir-query for example you can not have Location?_tag=salima-catchments with within x-fhir-query expression. You will get an exception that the _tag not found in resource Location.

Describe the solution you'd like
Be able to tag resources and use the tags to filter them using x-fhir-query expressions

Describe alternatives you've considered
A clear and concise description of any alternative solutions or features you've considered.

Additional context
Add any other context or screenshots about the feature request here.

Would you like to work on the issue?
I have a potential fix for this issue

[gosso22]

@maimoonak - I have created an issue description for the _tag and _profile work. I am ready to create the PR for it.

[santosh-pingle]

@aditya-07 Can you please add this issue to Android FHIR SDK project?