Add HTTP Provider

* feat: add HTTP provider implementation

* refactor: add SetDefaults and struct tag for the new file parser

* feat: add TLS configuration property

* refactor: rework HTTP provider implementation

* feat: provide config only once if fetched config is unchanged

* style: lint

* ui: add HTTP provider icon

* tests: simplify and fix integration test

* docs: add reference config for file

* docs: move http reference config for file

Co-authored-by: Daniel Tomcej <daniel.tomcej@gmail.com>

docs/content/reference/static-configuration/file.toml

@@ -205,6 +205,16 @@
       cert = "foobar"
       key = "foobar"
       insecureSkipVerify = true
+  [providers.http]
+    endpoint = "foobar"
+    pollInterval = 42
+    pollTimeout = 42
+    [providers.http.tls]
+      ca = "foobar"
+      caOptional = true
+      cert = "foobar"
+      key = "foobar"
+      insecureSkipVerify = true
 
 [api]
   insecure = true