Add "notes" to LFG requests

[malouro]

Is your feature request related to an existing command or feature? Please describe.
LFG

Describe the solution you'd like
A way to add additional information to the LFG party request. For example, if it's a lobby for Rocket League, adding a note like "Trying to rank up, but also would be down to play for fun", etc.

Some ways this could look in the command interface:

• via double quotes around the note:

!lfg lol aram "just for fun"

• via other enclosing tags?

!lfg lol aram [just for fun]
!lfg lol aram `this is serious`
!lfg lol aram |I don't really care|