Introduce NoOpStringPrinter

We discovered that attempting to print a very large string-like array
would succeed on the CLI, but in DAP would cause the "variables"
request to fail with:

  value requires 67038491 bytes, which is more than max-value-size

This turns out to be a limitation in Value.format_string, which
de-lazy-ifies the value.

This patch fixes this problem by introducing a new NoOpStringPrinter
class, and then using it for string-like values.  This printer returns
a lazy string, which solves the problem.

Note there are some special cases where we do not want to return a
lazy string.  I've documented these in the code.  I considered making
gdb.Value.lazy_string handle these cases -- for example it could
return 'self' rather than a lazy string in some situations -- but this
approach was simpler.

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