perf(filter): reduce allocations in parsing metric

[almostinf]

Reduce allocations in parsing metric

Reduced the number of allocations of the restoreMetricStringByNameAndLabels function by setting the capacity in strings.Builder, now the function makes stable 2 allocations to strings.Builder and to slice creation

benchmark                                          old ns/op     new ns/op     delta
BenchmarkRestoreMetricStringByNameAndLabels-12     1071          851           -20.57%

benchmark                                          old allocs     new allocs     delta
BenchmarkRestoreMetricStringByNameAndLabels-12     6              2              -66.67%

benchmark                                          old bytes     new bytes     delta
BenchmarkRestoreMetricStringByNameAndLabels-12     624           320           -48.72%

[almostinf]

/build

[github-actions]

Build and push Docker images with tag: 2024-07-03.973caa5

[github-actions]

Build and push Docker images with tag: 2024-07-03.973caa5