Add memory-based batching support

Implement memory-aware batch sizing with --batch-mem CLI option, enabling adaptive batching based on estimated sequence memory footprint. Key changes:
- Added _BatchMem and related getters/setters in pkg/obidefault
- Implemented RebatchBySize() in pkg/obiter for memory-constrained batching
- Added BioSequence.MemorySize() for conservative memory estimation
- Integrated batch-mem option in pkg/obioptions with human-readable size parsing (e.g., 128K, 64M, 1G)
- Added obiutils.ParseMemSize/FormatMemSize for unit conversion
- Enhanced pool GC in pkg/obiseq/pool.go to trigger explicit GC for large slice discards
- Updated sequence_reader.go to apply memory-based rebatching when enabled

pkg/obitools/obiconvert/sequence_reader.go

@@ -214,6 +214,10 @@ func CLIReadBioSequences(filenames ...string) (obiiter.IBioSequence, error) {
 
 	iterator = iterator.Speed("Reading sequences")
 
+	if obidefault.BatchMem() > 0 {
+		iterator = iterator.RebatchBySize(obidefault.BatchMem(), 1)
+	}
+
 	return iterator, nil
 }