fix(frontend): upstream option for anyof array

[nathan-vm]

• [x] fix: upstream option for anyof array
• [x] fix: #265
• [x] fix: anyOf(string, null) is rendering same options as anyOf(string, null, int, float, date, etc).
• [x] Add format verification when generating upstream options array

[vinicvaz]

anyOf(string, null) is rendering same options as anyOf(string, null, int, float, date, etc). We should render only the allowed types. For example, in email sender piece the arg_value of the InnerArgModel is typed as Optional[str] and the upstream options is allowing we select all types from Log piece.

[vinicvaz]

@nathan-vm Now is good but I think we should validate fields with "format" as well for generating upstream options. The way we have we are accepting date, datetime, time, enum in string fields. Strings without any format are pure strings Strings with date must connect only with strings with date, the same for time, datetime, etc.