Add alias scheme for arguments in R/mm_name.R

Reminder to implement the alias scheme for arguments in R/mm_name.R

See: https://github.com/DOI-USGS/streamMetabolizer/pull/469#discussion_r3615788808

Set an alias for each type in the argument, i.e.,
```
type=c(m='mle', b='bayes', b2='bayes_2station', n='night', K='Kmodel', s='sim')
```

and then change this code to (1) require exact matches, but accept matches to either the alias or full name, and (2) if an exact match doesn't exist but an approximate match is discovered, throw an informative error that exact matches to the alias or full name are now required. Update docs to reflect this new scheme.