MQE: add support for sort and sort_desc

[charleskorn]

What this PR does

This PR adds support in MQE for sort and sort_desc.

Performance compared to Prometheus' engine is slightly better, and peak memory consumption is the same:

goos: darwin
goarch: arm64
pkg: github.com/grafana/mimir/pkg/streamingpromql/benchmarks
cpu: Apple M1 Pro
                                     │ Prometheus  │               Mimir               │
                                     │   sec/op    │   sec/op     vs base              │
Query/sort(a_1),_instant_query-10      146.4µ ± 2%   142.4µ ± 2%  -2.71% (p=0.009 n=6)
Query/sort(a_100),_instant_query-10    839.6µ ± 1%   798.6µ ± 2%  -4.88% (p=0.002 n=6)
Query/sort(a_2000),_instant_query-10   11.14m ± 1%   10.78m ± 1%  -3.18% (p=0.002 n=6)
geomean                                1.110m        1.070m       -3.59%

                                     │  Prometheus  │               Mimir                │
                                     │      B       │      B        vs base              │
Query/sort(a_1),_instant_query-10      66.26Mi ± 1%   65.87Mi ± 1%       ~ (p=0.310 n=6)
Query/sort(a_100),_instant_query-10    61.38Mi ± 1%   60.78Mi ± 1%       ~ (p=0.128 n=6)
Query/sort(a_2000),_instant_query-10   62.58Mi ± 1%   62.93Mi ± 1%       ~ (p=0.143 n=6)
geomean                                63.37Mi        63.16Mi       -0.33%

Given sort and sort_desc only apply to instant queries and we have to load the entire set of data into memory to sort it, there's not much room for improvement over Prometheus' engine.

Which issue(s) this PR fixes or relates to

#10067

Checklist

• Tests updated.
• [n/a] Documentation added.
• [covered by Mimir Query Engine #10067] CHANGELOG.md updated - the order of entries should be [CHANGE], [FEATURE], [ENHANCEMENT], [BUGFIX].
• [n/a] about-versioning.md updated with experimental features.