Add a long read classifier: lemur

### Description of feature

Suggested by @jfy133 in [taxprofiler slack channel](https://nfcore.slack.com/archives/C031QH57DSS/p1719128116043699)

[Lemur](https://github.com/treangenlab/lemur) is a tool for rapid and accurate taxonomic profiling on long-read metagenomic datasets. 

