Add a tunable to remove symbols from *.cwasm files

[alexcrichton]

This commit adds a tunable option via -Dsymbols={y,n} or Config::debug_symbols to disable generation of symbols in output *.cwasm artifacts. This can help minimize the size of an artifact to the absolute bare minimum in some scenarios.

This additionally adds documentation of how to build a minimal *.cwasm with all the various options that can be used which affect the output artifact.

Closes #10286

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