Add STY:T021 as a mapping to biolink:GrossAnatomicalEntity

[gaurav]

Is your feature request related to a problem? Please describe.
Some UMLS concepts (UMLS:C0456626 "Whole body structures", UMLS:C0229961 "Carcass", UMLS:C1185545](https://uts.nlm.nih.gov/uts/umls/concept/C1185545) "Set of parts of human body") are mapped to semantic type STY:T021 "Fully Formed Anatomical Structure", which is defined as "An anatomical structure in a fully formed organism; in mammals, for example, a structure in the body after the birth of the organism". This is not currently mapped to any Biolink class.

Describe the solution you'd like
STY:T021 "Fully Formed Anatomical Structure" should be added as a mapping to biolink:GrossAnatomicalStructure.

What working group (or team) did this request originate from?
NodeNorm (Translator SRI/DOGSLED)

Note: This is relevant for members of NCATS Translator.

Additional context
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Tag relevant members for discussion
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