[feature] Encode slices as separator-delimited strings

[gudvinr]

Is your feature request related to a problem? Please describe.

Sometimes it is required to encode array-like data in queries as strings of elements delimited by some separator.
For example, OAuth2 specification says:

The value of the scope parameter is expressed as a list of space-
delimited, case-sensitive strings.

So, in this case if you want to encode (or decode) field you need to implement custom decoder to write scope as space-delimited string.

It is fine if you only use []string but you also need to do so for slices of custom types like type Scope string separately. It's not possible to support arrays of different cardinality.

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Describe the solution you'd like

Implement handling of additional options in struct tags such as space and comma to support commonly used delimiters to encode array-like data.

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Describe alternatives you've considered

Write custom encoder and decoder for every slice type and register them in every instance of schema.Encoder and schema.Decoder.

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[stale]

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