fix: allow crictl config to create a missing explicit file

[immanuwell]

What type of PR is this?

/kind bug

What this PR does / why we need it:

Fixes a small but real crictl config paper cut.

If you pass a custom --config path and the file is missing, config --set dies in startup before the config command can create the file. That makes the bootstrap flow kinda busted.

This patch lets config --set and the positional config key value path create the missing file, and keeps config --get and config --list read-only.

Repro:

tmpdir=$(mktemp -d)
crictl --config "$tmpdir/crictl.yaml" config --set debug=true

Before this PR, that fails with a get server config error.

Which issue(s) this PR fixes:

Fixes #2143

Special notes for your reviewer:

Checked with the built crictl binary and the existing crictl: config e2e suite. This bug is easy to hit in normal local CLI use, no weird limits or edge conditions needed.

Does this PR introduce a user-facing change?

`crictl config --set` and `crictl config <key> <value>` now create a missing explicit `--config` file instead of failing during startup.

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[SergeyKanzhelev]

Fixes a small but real crictl config paper cut.

So the scenario is downloading crictl, and use config set commands to set all properties? I wonder if we need a new command that creates an empty config file instead. I think the crictl config were supposed to do it. Is it a regression? I wonder if I induced it when introduced global span for tracing. Would you be willing to see if this is a regression?

[immanuwell]

@SergeyKanzhelev addressed your suggestions, please take a look