cmd/exec: Supporting simultaneous input from stdin and files

[johanfylling]

Previously, opa exec --stdin-input input1.json input2.json would read input from stdin, but ignore the provided input file paths.

[johanfylling]

$ opa exec -h
Execute against input files.

The 'exec' command executes OPA against one or more input files. If the paths
refer to directories, OPA will execute against files contained inside those
directories, recursively.

The 'exec' command accepts a --config-file/-c or series of --set options as
arguments. These options behave the same as way as 'opa run'. Since the 'exec'
command is intended to execute OPA in one-shot, the 'exec' command will
manually trigger plugins before and after policy execution:

Before: Discovery -> Bundle -> Status
After: Decision Logs

By default, the 'exec' command executes the "default decision" (specified in
the OPA configuration) against each input file. This can be overridden by
specifying the --decision argument and pointing at a specific policy decision,
e.g., opa exec --decision /foo/bar/baz ...

Alternative Usage:
  opa_darwin_arm64 exec [<path> [...]] --stdin-input [flags]

Usage:
  opa_darwin_arm64 exec <path> [<path> [...]] [flags]

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