.Net: Merge the Prompty feature branch to main (microsoft#6097)

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---------

Co-authored-by: Xiaoyun Zhang <[email protected]>
Co-authored-by: Cassie Breviu <[email protected]>
Co-authored-by: Stephen Toub <[email protected]>
Co-authored-by: Dmytro Struk <[email protected]>

.github/_typos.toml

@@ -25,6 +25,7 @@ HD = "HD" # Test header value
 EOF = "EOF" # End of File
 ans = "ans" # Short for answers
 arange = "arange" # Method in Python numpy package
+prompty = "prompty" # prompty is a format name.
 
 [default.extend-identifiers]
 ags = "ags" # Azure Graph Service