Introduce neuro config quota show

[dalazx]

We need to be able to communicate to our users about their quota situation.

neuro config quota show should render the current jobs run-time consumed and quota for the current user's cluster.

The information should be retrieved using neuro-inc/platform-api#901.

Optionally, the command should output a suggestion for topping up the quota.

cc @asvetlov @mariyadavydova

[asvetlov]

It can live in config group for now.
When we implement organizations we can reconsider the command position, moving with the deprecation of previous notation is not a big deal.

[mariyadavydova]

Totally agree, let's keep it in config group for now.

[atemate]

Guys are we OK with this output format?

GPU left: 167h 23m 32s (quota: 200h 00m 00s)
CPU left:  00h 00m 32s (quota: 1000h 00m 00s)

[mariyadavydova]

@ayushkovskiy 👍

[atemate]

Huh, we don't provide seconds for quota.. So the formatting will look like:

GPU left: 167h 23m (quota: 200h 00m)
CPU left:  00h 00m (quota: 1000h 00m)

@mariyadavydova HDYT wouldn't it look weird without seconds?

[mariyadavydova]

@ayushkovskiy Well, that's OK. I don't think that seconds really matter here, when we speak about 100h quotas.

[atemate]

How do we format lack of quota? (quota: NaN) or (quota: not set) or (quota: None) or (quota: ∞)?

[mariyadavydova]

The last one is the most accurate, I guess.

[atemate]

the sign looks too tiny

[mariyadavydova]

We may simply say (quota: infinite). I don't think that this question is very important ATM, though, because those who have no quota (i.e. non-free-tier folks) will hardly ever execute this command.

[asvetlov]

+1 for 'infinity'. Not all terminals support Unicode symbols.

[atemate]

if quota == infinity, left is also infinity. Let's stick to this formatting:

GPU spent: 167h 23m (quota: 170h 23m, left: 03h 00m)
CPU spent:  00h 00m (quota: infinity)