Robert Pająk d7ebb7aa85 log: Add ValueFromAttribute and KeyValueFromAttribute (#6180) ...

Fixes https://github.com/open-telemetry/opentelemetry-go/issues/6158

Related spec PR:
https://github.com/open-telemetry/opentelemetry-specification/pull/4373

Benchmark results:

```
goos: linux
goarch: amd64
pkg: go.opentelemetry.io/otel/log
cpu: 13th Gen Intel(R) Core(TM) i7-13800H
BenchmarkKeyValueFromAttribute/Empty-20              72029505                16.47 ns/op            0 B/op          0 allocs/op
BenchmarkKeyValueFromAttribute/Bool-20               68560222                16.99 ns/op            0 B/op          0 allocs/op
BenchmarkKeyValueFromAttribute/BoolSlice-20          14647401                76.21 ns/op           50 B/op          2 allocs/op
BenchmarkKeyValueFromAttribute/Int64-20              70737378                16.92 ns/op            0 B/op          0 allocs/op
BenchmarkKeyValueFromAttribute/Int64Slice-20         16780069                96.87 ns/op           64 B/op          2 allocs/op
BenchmarkKeyValueFromAttribute/Float64-20            59299638                16.93 ns/op            0 B/op          0 allocs/op
BenchmarkKeyValueFromAttribute/Float64Slice-20       12691222               106.2 ns/op            64 B/op          2 allocs/op
BenchmarkKeyValueFromAttribute/String-20             63837711                16.97 ns/op            0 B/op          0 allocs/op
BenchmarkKeyValueFromAttribute/StringSlice-20         9251001               114.7 ns/op            80 B/op          2 allocs/op
PASS
ok      go.opentelemetry.io/otel/log    14.776s
```

2025-01-22 08:26:46 +01:00

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