Add explicit --pass-through flag and default to enabled for *cat (#3223)

Fixes #3211.

Adds the `--[no-]pass-through` flag which enables/disables pass-through mode.

* `zstdcat`, `zcat`, and `gzcat` default to `--pass-through`.
  Pass-through mode can be disabled by passing `--no-pass-through`.
* All other binaries default to not setting pass-through mode.
  However, we preserve the legacy behavior of enabling pass-through
  mode when writing to stdout with `-f` set, unless pass-through
  mode is explicitly disabled with `--no-pass-through`.

Adds a new test for this behavior that should codify the behavior we want.

tests/cli-tests/decompression/pass-through.sh.stdout.exact

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++ passthrough enabled
+
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++ passthrough disabled
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