Allow units of measure in sequence ranges

I propose we extend sequence expressions to handle ranges involving units of measure. Currently we cannot do the following:
```
let maximumDistance = 3
let minimumDistance = 1
let trials = [ minimumDistance .. maximumDistance ]
```

The existing way of approaching this problem in F# is to generate a range from bare integers and then map a multiplication to add the dimension

## Pros and Cons

The advantages of making this adjustment to F# are
- An improvement to the safety of code by removing error potential in dropping the units and then adding them back
- More concise, readable code

The disadvantages of making this adjustment to F# are
- None that I can think of

## Extra informtion

Estimated cost (XS, S, M, L, XL, XXL):
M? (because of the added complication of ``min .. step .. max``)

Related suggestions: (put links to reated suggestions here)
[Allow units of measure in for loops #534 ](https://github.com/fsharp/fslang-suggestions/issues/534)

## Affadavit (must be submitted)

Please tick this by placing a cross in the box:
* [x] This is not a question (e.g. like one you might ask on [stackoverflow](http://stackoverflow.com)) and I have searched stackoverflow for discussions of this issue
* [x] I have [searched both open and closed suggestions on this site](http://github.com/fsharp/fslang-suggestions/issues) and believe this is not a duplicate
* [x] This is not something which has obviously "already been decided" in previous versions of F#. If you're questioning a fundamental design decision that has obviously already been taken (e.g. "Make F# untyped") then please don't submit it.

Please tick all that apply:
* [x] This is not a breaking change to the F# language design
* [x] I would be willing to help test this
* [ ] I or my company would be willing to help crowdfund F# Software Foundation members to work on this

No files, tests, or entry points are identified in the proposal. Review the related for-loop suggestion (#534) and evaluate the shown unit-of-measure range examples, including the min..step..max form; done means an agreed language design and a validated implementation plan.

Written by the indexing model from the issue text.