* Vendor github.com/braydonk/yaml

The yaml.v3 package upstream is now archived. This means there is no hope of my patches ever being committed upstream. As such, there is
nothing to gain by maintaining this library in a separate repo.
It will be easier for people to contribute to if it's in this repo.
I will keep github.com/braydonk/yaml alive purely for the select few who pull
the package for the couple of patches that upstream never merged.

* fix test workflows cause the yaml package fails everything

* pkg/yaml: correct alias keys

As outlined in #247, the yaml library did not initially handle this edge
case of using an alias node as a key properly. This PR adds
functionality to correct that. In case there is some other edge case
where this breaks, the `disable_alias_key_correction` formatter config
option was added.

* forgot to fix this comment

* forgot to enable the setting for this test

* formatters/basic: add force_array_style

This PR adds the `force_array_style` feature to the basic formatter,
which allows the user to force either `block` or `flow` sequence style
in the formatted document.

* add the license I forgot

* remove TODO comment I left in

* oops overwrote the test expectation

* readded removed newline

* Add options for seeing which files were formatted

This PR adds two features for keeping track of which files were edited
by yamlfmt:

`-verbose`, `-v`: When formatting with verbose mode on, the modified
paths will be printed.

`-debug diffs`: When formatting with `diffs` debug code, all formatting
diffs will be printed.

Additionally:

* Fixed the `tempfile` bug that wouldn't replicate subdirectories
  properly
* Added `-q` short version of the `-quiet` flag

* fix integration tests

similar to #231.

When `yaml.v3` parses a document that's just comments, it ends up
parsing no actual nodes and thus loses the comment information. This
will now be treated as an edge case and return the original content, in
essence not modifying it if the yaml parsed successfully but no nodes are
parsed out.

* fix(yaml): Remove trailing whitespace from merge aliases.

PR #247 introduced a regression with YAML documents such as this:

```yaml
config: &shared
  key: value

instance:
  <<: *shared
```

Due to the "correct alias keys" setting, a extra space was emitted after
`*shared`. This created trailing whitespace which many tools (rightly) complain
about.

This change adds an extra condition to only emit the space in the "simple key"
context. I'm not enough of a YAML expert to be sure this is the right thing to
do, but it fixes my problem without failing any of the existing tests.

* test(formattest): Print a diff between the expected and actual result.