fix: load format from config file

[bendrucker]

Fixes handling of format inside a config {} block in a TFLint configuration file. Previously, cli.formatter.Format was set to options.Format and never considered the configuration file.

Now, NewCLI parses the config too and uses the merged config and options to set the format. The implementation is a bit hacky because a formatter needs to be constructed early to print errors.

Closes #2305

[wata727]

Thank you for working on this.

This issue seems a bit trickier than we thought. As I left in the comments, we can't simply load the config first. It looks like we need to consider a different approach.

[wata727]

We must set the log level before loading the config, otherwise debug logs will always be shown.
Doing this will remove the hack in integrationtest/recursive/recursive_test.go.

[wata727]

If we load a config outside of withinChangedDir, --chdir will be ignored.

$ tree -a
.
├── .tflint.hcl
└── work
    └── .tflint.hcl
$ cat .tflint.hcl
config {
  format = "json"
}
$ cat work/.tflint.hcl
config {
  format = "compact"
}

$ tflint --chdir work
{"issues":[],"errors":[]}