feat(ignore): Typos-specific ignores

THis is to help with cases like a monorepo with vendored dependencies.
A user might want to search (`.ignore`) them but not hold the code to
the same standards as first-party code.

Fixes #134

docs/reference.md

@@ -15,6 +15,7 @@ Configuration is read from the following (in precedence order)
 | Field                  | Argument          | Format | Description |
 |------------------------|-------------------|--------|-------------|
 | files.binary           | --binary          | bool   | Check binary files as text |
+| files.ignore-patterns  |                   | list of strings | Typos-specific ignore globs (gitignore syntax) |
 | files.ignore-hidden    | --hidden          | bool   | Skip hidden files and directories. |
 | files.ignore-files     | --ignore          | bool   | Respect ignore files. |
 | files.ignore-dot       | --ignore-dot      | bool   | Respect .ignore files. |