Improvement: sample by attribute key, message or any hash

[samber]

Some ideas:

slogsampling.ThresholdSamplingOption{
	Rate: 100,
        ByHash: func(r *slog.Record) []byte {
              return []byte(r.Message)
        },
}

slogsampling.ThresholdSamplingOption{
	Rate: 100,
        ByHash: func(r *slog.Record) []byte {
              return BloomFilter([]byte(r.Message))
        },
}

slogsampling.ThresholdSamplingOption{
	Rate: 100,
        ByAttributeKey: []string{"http", "request", "header", "cf-connecting-ip"},
}

slogsampling.ThresholdSamplingOption{
	Rate: 100,
        BySource: true,   // might be very costly to look for stacktrace
}

slogsampling.ThresholdSamplingOption{
	Rate: 100,
        ByDistance: slogsampling.LevenshteinDistance(xxx),   // just brainstorming - definitely a VERY bad idea 😁
}

We have to keep track of hash/keys. A garbage collector must remove old entries in LRU or LFU manner.

The bloom filter could be embedded into the library on behalf of the developer.