Ebonics - African American vernacular English

No, African American Vernacular English is a dialect of English. You can be fluent in both "standard" English and AAVE, but to be bilingual you must be able to speak two languages, not two dialects of the same language.

"Imma wife you" is African-American Vernacular English for "I'm going to marry you", directed at a woman.

Yes, Black English, also known as African American Vernacular English (AAVE), is considered a native variety of English. It has its own grammar, vocabulary, and pronunciation characteristics that have developed within the African American community in the United States.

You need to ask the question the other way round. What is Ebonics, answer Black Speech, African American Vernacular English