perf(logql): Micro-optimizations for IP filter

[KasonBraley]

What this PR does / why we need it:

Small micro optimizations to save some allocations for the IP filter in logql.

goos: darwin
goarch: arm64
pkg: github.com/grafana/loki/v3/pkg/logql/log
cpu: Apple M2 Pro
                                       │   old.txt    │               new.txt               │
                                       │    sec/op    │    sec/op     vs base               │
_IPFilter/127.0.0.1-10                   5.098µ ±  1%   3.168µ ±  1%  -37.86% (p=0.002 n=6)
_IPFilter/192.168.0.1-192.189.10.12-10   5.128µ ±  1%   3.288µ ± 24%  -35.89% (p=0.002 n=6)
_IPFilter/192.168.4.5/16-10              4.844µ ± 11%   3.063µ ±  2%  -36.76% (p=0.002 n=6)
geomean                                  5.022µ         3.172µ        -36.84%

                                       │   old.txt   │              new.txt              │
                                       │    B/op     │    B/op     vs base               │
_IPFilter/127.0.0.1-10                   425.00 ± 0%   32.00 ± 0%  -92.47% (p=0.002 n=6)
_IPFilter/192.168.0.1-192.189.10.12-10   424.00 ± 0%   32.00 ± 0%  -92.45% (p=0.002 n=6)
_IPFilter/192.168.4.5/16-10              425.00 ± 0%   32.00 ± 0%  -92.47% (p=0.002 n=6)
geomean                                   424.7        32.00       -92.46%

                                       │   old.txt   │              new.txt              │
                                       │  allocs/op  │ allocs/op   vs base               │
_IPFilter/127.0.0.1-10                   10.000 ± 0%   3.000 ± 0%  -70.00% (p=0.002 n=6)
_IPFilter/192.168.0.1-192.189.10.12-10   10.000 ± 0%   3.000 ± 0%  -70.00% (p=0.002 n=6)
_IPFilter/192.168.4.5/16-10              10.000 ± 0%   3.000 ± 0%  -70.00% (p=0.002 n=6)
geomean                                   10.00        3.000       -70.00%

Which issue(s) this PR fixes:
Fixes #

Special notes for your reviewer:

Checklist

• Reviewed the CONTRIBUTING.md guide (required)
• Documentation added
• Tests updated
• Title matches the required conventional commits format, see here
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[cyriltovena]

LGTM