Expose schedule memo and search attributes in list

[dnr]

What was changed

Expose schedule's memo and search attributes in schedule list command.
Note these are not printed by default, you can use either -o json for a full dump or selectively enable them with --fields ScheduleId,SearchAttributes,Memo.
The values are always converted to strings for now. In the rewrite we can handle types better.

Why?

Fixes #433

Checklist

2. How was this tested:
   manually

[cretz]

Hrmm, memo and search attributes aren't even shown when listing workflows. Should we do this there too?

(CLI refresh project has no concept of customizing list fields currently so we may have to add that concept)

[dnr]

I'm not sure customizing list fields is that useful. The key point to me is that the list view should be fairly readable, though it may omit some available information, and if you want all the information, you can use the json view and format manually.

[dnr]

Going to close this PR since we're rewriting things. This should be incorporated into #459.