Catch up to all latest PromQL features, enable experimental functions

[juliusv]

This updates UI and backend dependencies such that PromLens supports the latest PromQL features, such as:

• limitk() / limit_ratio() operators
• all current experimental functions, such as mad_over_time() and native histogram ones
• updated function documentation

[SuperQ]

Hey @juliusv, we fixed up the build and a bunch of the dependencies. You should be able to rebase this now.

[SuperQ]

Ping, can you rebase this PR?

[juliusv]

I'll take a look - it's been a while and I think there is going to be a bunch more PromQL stuff that would need to be updated by now (especially the UTF-8 stuff), and I'm not sure how much effort that will be.

[juliusv]

Notes to myself (or maybe someone else) for when I have time to implement this, things that are new in PromQL that also need to be added:

• There's arithmetic between durations now, e.g. foo[5m * 2] or foo offset 1m * 5, so there needs to be UI support for potentially showing a whole expression child node for these cases, where previously the entire selector was always a single node only.
• Metric names and labels can be full UTF-8 now, influencing how selectors / series identifiers need to be rendered and also influencing other functions like label_replace() etc.
• holt_winters() got renamed to double_exponential_smoothing() (only available when enabling experimental PromQL functions)
• There's an experimental info() function now
• There's of course native histograms, but they are as a whole still experimental