Deprecate record for DeterministicVariables

[damonbayer]

Originally posted by @damonbayer in #402 (comment)

DeterministicVariables should not have a record argument. Instead, they should take an optional name argument. If a name is supplied, the variable should always be recorded. If the name is omitted, then the variable should not be recorded.

For "composite RandomVariables containing multiple sites, each site should have an optional name argument, which determines whether the site is recorded.

[damonbayer]

This should extend to TransformedRandomVariables. They can be optionally named, and the naming should influence whether or not the transformed version of the variable is recorded.