feat: add options to disable tests/benchmarks

[aminya]

When building Filament from the source for production from a package manager like vcpkg, these options allow turning off the tests and benchmarks that are not needed for using the library. This significantly reduces compilation time.

Note that I didn't indent the ifs for a smaller diff to make it easier to review, but I can do that if needed.

This is cherry-picked from my PR for allowing filament to be built via vcpkg:
microsoft/vcpkg#41916

[pixelflinger]

what is the reason for this PR?

[aminya]

When building Filament from the source for production from a package manager like vcpkg, these options allow turning off the tests and benchmarks that are not needed for using the library. This significantly reduces compilation time. @pixelflinger

[aminya]

Note that I didn't indent the ifs for a smaller diff to make it easier to review, but I can do that if needed.

[poweifeng]

Closing due to this PR having been idle for a while. If you'd like to continue, would you mind first opening a feature request issue and we can have a discussion there to better understand the need?
(related PRs #8267 #8266 #8245)

[aminya]

@poweifeng The PR was ready to be reviewed. Could you tell me if you expected a specific activity?

[patrikhuber]

Also a thumbs up from me here, this is useful for the reasons mentioned by @aminya.