refactor(textlint-formatter): move to @textlint/linter-formatter

[0x6b]

Ref #455.

Note: I did not change CLI name from textlint-formatter to linter-formatter for compatibility. I think textlint-formatter is more intuitive name for users, but if you think linter-formatter is better, please let me know and I will update this pull request as follows:

1. Add linter-formatter.js to bin/ directory
2. Add above to package.json#bin as key linter-formatter
3. (Optional?) Add deprecate message while running textlint-formatter (bin/cmd.js)

Need major version bump as it will break CI build. Thanks.

[azu]

(Optional?) Add deprecate message while running textlint-formatter (bin/cmd.js)

No. Runtime message break exiting behavior.

Instead of it, You can deprecate old module by executing following command:

npm deprecate textlint-formatter "See https://github.com/textlint/textlint/issues/455"

As as result, show deprecated message in installing time.

npm install textlint-formatter 
# show deprecated message

[azu]

Need major version bump as it will break CI build.

Yes and No.
These are difference name, but the API is same.
So, It does not require major update.

ℹ️ Migration information for user
#455

[azu]

LGTM.

Please do npm depreacate old module before merging.
#474 (comment)

[0x6b]

@azu, appreciate your comments. I missed update (and detailed!) description at #455. Run npm deprecate then merge the pull request. Thank you very much.

[0x6b]

For the record:

$ npm deprecate textlint-formatter "See https://github.com/textlint/textlint/issues/455"
$ npm info --json textlint-formatter | jq .deprecated
"See https://github.com/textlint/textlint/issues/455"