cirq.X and cirq.X**(-1) render the same in text diagrams

Is your feature request related to a use case or problem? Please describe.

import cirq 
a = cirq.LineQubit(1)   
cirq.Circuit(cirq.X.on(a), cirq.X.on(a)**(-1))  

> 1: ───X───X───

Now, this is sensible because X and -X have the same unitary up to a global phase. However, X and -X are implemented differently when you run them on hardware, and we use this fact sometimes when doing experiments on hardware.

Describe the solution you’d like I think it’d make sense to render the exponent when it’s -1, like

> 1: ───X───X^-1───

What is the urgency from your perspective for this issue? Is it blocking important work?

P3 - I’m not really blocked by it, it is an idea I’d like to discuss / suggestion based on principle

[viathor]

Regarding rendering, in the unicode mode we could render X inverse as X† which is merely two characters long instead of five in X**-1.

[vtomole]

@Ishan-Gokhale I’ve assigned it to you.