Add file specific and project specific exceptions

[izmalk]

Implement a way to add project-wide and file-wide exceptions for Vale style checks.

For example:

 /home/izmalk/test/docs/izmalk/kafka-k8s-operator/docs/reference/r-statuses.md
 12:28  error    Did you really mean 'params'?   Vale.Spelling                          
 22:5   warning  Avoid the phrase 'Terminated'   Canonical.020-Cliche-words-and-phrases 

In the above output we see an error for the params which is a quote of the exact output produced by a program and a warning for the Terminated word, which is a name of a status and a correct technical term in this context.

I'd like to have a way to set project-specific and, ideally, file-specific exceptions for Vale checks.
File-specific exceptions are great for specific stuff that should not affect the whole project, like quotes of the output or status names.