Add TCP Middlewares support

docs/content/middlewares/http/addprefix.md

docs/content/middlewares/http/basicauth.md

docs/content/middlewares/http/buffering.md

docs/content/middlewares/http/chain.md

docs/content/middlewares/http/circuitbreaker.md

docs/content/middlewares/http/compress.md

docs/content/middlewares/http/contenttype.md

docs/content/middlewares/http/digestauth.md

docs/content/middlewares/http/errorpages.md

docs/content/middlewares/http/forwardauth.md

docs/content/middlewares/http/headers.md

docs/content/middlewares/http/inflightreq.md

docs/content/middlewares/http/ipwhitelist.md

docs/content/middlewares/http/overview.md

docs/content/middlewares/http/passtlsclientcert.md

docs/content/middlewares/http/ratelimit.md

docs/content/middlewares/http/redirectregex.md

docs/content/middlewares/http/redirectscheme.md

docs/content/middlewares/http/replacepath.md

docs/content/middlewares/http/replacepathregex.md