Remove numeric literal suffixes

[bentsherman]

Remove literal suffixes like 7d, 7f, 7L, since they are not needed in Nextflow and can lead to syntax ambiguities (e.g. 7d versus 7.d)

[pditommaso]

I'm not sure about introducing such slight variation in the lang, this let to sub-dialect with minor, annoying incompatibilities across java, groovy and different nextflow versions

[pditommaso]

In the specific case likely a better solution would be a type linter or checker to avoid a number is assigned to time/duration field

[bentsherman]

Type checking won't really help here because a duration field can be initialized from a number, string, or duration literal.

As for syntax changes, I agree in general about not changing things that don't need to be changed. That's why I left the numeric syntax unchanged. But if some syntax is never used in Nextflow and creates foot-guns, I think it's fair to remove. Especially right now when we are refining the Nextflow language spec.

[bentsherman]

The d suffix is also part of Java, which makes me less comfortable removing it. We can come up with a linter rule to catch this issue if needed