2.7: Add alternative way to configure 'wrap-as-array', as CsvParser feature

[cowtowncoder]

Currently ability to wrap contents as array is defined as a CsvParser.Feature. This work, but since it is not known to general databinding, it can not be changed on per-call basis yet.

But with 2.7, support will be added for a general facility via FormatFeature (see FasterXML/jackson-databind#819). CSV module needs to make sure it is wired to support this.
2.6 already added CsvGenerator.overrideFormatFeatures() / CsvParser.overrideFormatFeatures() which should help.

NOTE: one problematic aspects is that instead of getting feature flags passed on constructor, they are now sent immediately after this. So parser/generator need to be aware that some features are NOT yet available when instance is constructed.