Feature request (low-priority): functions for information about infusion doses

[billdenney]

Should we enable functions to extract information about times since infusion doses and parameters about the infusion doses?

• Time of dose end (for infusions): Potential option: tlast(cmt, end=TRUE) (cmt is optional)
• Time since dose end (for infusions): Potential option: tad(cmt, end=TRUE) (cmt is optional)
• Rate of infusion: Potential option: dose.rate(cmt) (cmt is optional)
• Duration of infusion: Potential option: dose.rate(cmt, dur=TRUE) (cmt is optional)

Edited from comment originally posted by @mattfidler in https://github.com/nlmixr2/rxode2/issues/98#issuecomment-1055534907

[mattfidler]

R based function expressions like tlast(cmt, end=TRUE) are not currently supported by the internal parser and would take too much time to implement

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