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Compute length at compile time for literal strings
Add unsafePackLiteral to Data.ByteString.Internal. With GHC-8.10+, use known-key variant of C `strlen` from `GHC.CString` that supports constant folding. Also in GHC 8.10, another data constructor of ForeignPtrContents becomes available: LiteralPtr. For string literals, this is now used. It saves space when there are lots of literals, and it improves opportunities for case-of-known data constructor optimizations when a function scrutinizes the length of a ByteString.
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