Add the language tags in the dataset.

[MohsinTariq10]

Add the languages tags in the benchmarking dataset like "solidity", "rust", "move" etc. Will be easier for people who want to benchmark only a certain type of detectors.

[gustavo-grieco]

Related to #2

[muellerberndt]

Since there seems to be demand for this, does anybody want to contribute a PR? The tags would have to be auto-added during dataset creation and the existing curated dataset would need to be updated.