Expose requested environment on Remote

[ascorbic]

Different drivers are inconsistent in how they report the browser and platform name and version, and IE for example doesn't report the OS version at all. This makes it hard to check the current platform from within tests. This PR adds a requestedEnvironment property to the remote object so that you can see the environment that you requested.

[jsf-clabot]

All committers have signed the CLA.

[codecov-io]

Codecov Report

Merging #978 into master will decrease coverage by 0.01%.
The diff coverage is 0%.

@@            Coverage Diff             @@
##           master     #978      +/-   ##
==========================================
- Coverage   56.75%   56.74%   -0.02%     
==========================================
  Files          60       60              
  Lines        4678     4679       +1     
  Branches     1009     1009              
==========================================
  Hits         2655     2655              
- Misses       2023     2024       +1

Impacted Files	Coverage Δ
src/lib/executors/Node.ts	0% <0%> (ø)	⬆️

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[jason0x43]

There's still a chance that the OS or browser version you end up with might not be exactly what you asked for, but I can still see this being a useful indicator.

[ascorbic]

That's great. Thanks for merging. When can we expect the next release?