[Feature Request] Add f-string support

[Kratosix]

I seem to not use f-strings in Mojo, for example Here's my code
let g = 54 print(f'{g}')

And I seem to be getting this error
error: Expression [6]:17:12: expected ')' in call argument list
print(f'{g}')
^

Is there anyway to fix this issue, thanks for your patience.

[binarycache]

None of the python formatting works.

Neither .format nor %

I think this is linked to #9 (comment) string concatenation bug too.

[Kratosix]

Ok that's really cool, when will this be allowed to be used. THANKS