adding Tor version into "about:brave"

[kjozwiak]

Test plan

See #14543

Description

Maybe we won't have enough time to do this in the initial release, but I think it would be a good idea to include which Tor version Brave is using within about:brave. This way, users that don't know how to run Brave via a terminal/console and quickly check which version is being used.

Steps to Reproduce

1. launch 0.23.x which includes Tor PT's
2. open about:brave

Actual result:

We're not listing the Tor version within about:brave. Users will need to run brave through the terminal/console to see which version of Tor is being used. Windows doesn't really output this information either. See #14463 (comment)

Expected result:

Users should be able to load about:brave and see which version of Tor is currently being used.

Reproduces how often:

100% reproducible using the latest 0.23.x build.

Brave Version

about:brave info:

Brave: 0.23.16 
V8: 6.7.288.46 
rev: 2042c4572e43fed49765fb3fc8f26d5a7293ac75 
Muon: 7.1.1 
OS Release: 17.5.0 
Update Channel: Release 
OS Architecture: x64 
OS Platform: macOS 
Node.js: 7.9.0 
Brave Sync: v1.4.2 
libchromiumcontent: 67.0.3396.87

Reproducible on current live release:

Not reproducible in the current released build as Tor is a new feature that's being released in 0.23.x.

Additional Information

[srirambv]

+1 on adding info in about:brave.

[LaurenWags]

+1 from me

[bsclifton]

Fixed with #14543

[srirambv]

[kjozwiak]

@riastradh-brave @bsclifton @diracdeltas thanks for getting this into 0.23.x 👍