Accordion: add error labels in title & add FeedbackLabel

[carlinmack]

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Description

Added error summary labels in AccordionTitle
Added FeedbackLabel component to show inline errors
Added util function to categorize and flatten errors
Added ids to custom and domain fields

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[0einstein0]

Put a deprecation warning on flattenedErrors i.e. old error format

[kpsherva]

what is prefix?

[0einstein0]

the prefix param is used to track the hierarchy of keys when recursively flattening nested objects