vendor: move vendored sources in-tree

This should make it easier to see changes instead of just a blob

vendor/github.com/go-openapi/swag/README.md

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+# Swag [![Build Status](https://github.com/go-openapi/swag/actions/workflows/go-test.yml/badge.svg)](https://github.com/go-openapi/swag/actions?query=workflow%3A"go+test") [![codecov](https://codecov.io/gh/go-openapi/swag/branch/master/graph/badge.svg)](https://codecov.io/gh/go-openapi/swag)
+
+[![Slack Status](https://slackin.goswagger.io/badge.svg)](https://slackin.goswagger.io)
+[![license](http://img.shields.io/badge/license-Apache%20v2-orange.svg)](https://raw.githubusercontent.com/go-openapi/swag/master/LICENSE)
+[![Go Reference](https://pkg.go.dev/badge/github.com/go-openapi/swag.svg)](https://pkg.go.dev/github.com/go-openapi/swag)
+[![Go Report Card](https://goreportcard.com/badge/github.com/go-openapi/swag)](https://goreportcard.com/report/github.com/go-openapi/swag)
+
+Contains a bunch of helper functions for go-openapi and go-swagger projects.
+
+You may also use it standalone for your projects.
+
+* convert between value and pointers for builtin types
+* convert from string to builtin types (wraps strconv)
+* fast json concatenation
+* search in path
+* load from file or http
+* name mangling
+
+
+This repo has only few dependencies outside of the standard library:
+
+* YAML utilities depend on `gopkg.in/yaml.v3`
+* `github.com/mailru/easyjson v0.7.7`