Added new command line option `--info:X` to nimsuggest for obtaining information. (#22940)

`--info:protocolVer` returns the highest nimsuggest protocol version
that is supported (currently, it's version 3).
`--info:nimVer` returns the Nim compiler version that nimsuggest uses
internally.

Note that you can obtain the Nim compiler version via `nimsuggest -v`,
but that requires parsing the output, which looks like this:

```
Nim Compiler Version 2.1.1 [Linux: amd64]
Compiled at 2023-11-14
Copyright (c) 2006-2023 by Andreas Rumpf

git hash: 47ddfeca5247dce992becd734d1ae44e621207b8
active boot switches: -d:release -d:danger --gc:markAndSweep
```

`--info:nimVer` will return just:

```
2.1.1
```

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