Update denom regex formater in compile

[iramiller]

Currently the unrestricted denom expression does not include the anchors but they are always required

provenance/x/marker/types/denom.go

Line 248 in 95cdb69

if r, err := regexp.Compile(params.UnrestrictedDenomRegex); err != nil {

Update this to the following style from the SDK so that the regex is always properly anchored

 r, err := regexp.Compile(fmt.Sprintf(`^%s$`,params.UnrestrictedDenomRegex))

[iramiller]

We don't want to use the slash due to IBC... seems like adding period and dash to our unrestricted denom expression (limit 2,64 length) and to the base coin denom (2,127 length--set in app.go) are the best option.