Updated API Code Samples (#24141)

* api: remove PHP code samples

* api: remove Curl code samples

* api: remove Go code samples

* link out to marketplace exclusively for community-built drivers

* absolute path to V4_SRC

* programmatically extract x-codeSamples

* initial batch of examples

* Update api/server/main.go

Co-authored-by: Alejandro García Montoro <alejandro.garciamontoro@gmail.com>

* Update api/server/main.go

Co-authored-by: Alejandro García Montoro <alejandro.garciamontoro@gmail.com>

* Update api/server/main.go

Co-authored-by: Alejandro García Montoro <alejandro.garciamontoro@gmail.com>

* updated examples

---------

Co-authored-by: Alejandro García Montoro <alejandro.garciamontoro@gmail.com>

api/server/go.mod

@@ -0,0 +1,19 @@
+module github.com/mattermost/mattermost/api/internal
+
+go 1.20
+
+require (
+	github.com/pb33f/libopenapi v0.9.6
+	golang.org/x/tools v0.0.0-20201224043029-2b0845dc783e
+)
+
+require (
+	github.com/dprotaso/go-yit v0.0.0-20220510233725-9ba8df137936 // indirect
+	github.com/vmware-labs/yaml-jsonpath v0.3.2 // indirect
+	golang.org/x/mod v0.3.0 // indirect
+	golang.org/x/net v0.2.0 // indirect
+	golang.org/x/sync v0.1.0 // indirect
+	golang.org/x/sys v0.2.0 // indirect
+	golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1 // indirect
+	gopkg.in/yaml.v3 v3.0.1 // indirect
+)