sync develop with main (#119)

* chore: remove unused rules from nvim selene setup

* test: add test for config

* chore: update tasks, run tests on all recent versions

* refactor(test): make helper test function more ergonomic

In my opinion, requiring user to access tests via `T["module_name"]`
was too fragile and typos prone.

* fix(config): typo annotations

* chore(ci): install go bins via gopher.nvim itself

* feat(struct_tags): add range support (#117)

* feat(struct_tags): add range support

* refactor: use `start`, and `end_` naming for ranges

* fix(testutils): validate provided cursor position

* chore: update CONTRIBUTING.md

* chore: add demos (#118)

* chore: add dataset for demos

* chore(demos): add demos

* chore: update CONTRIBUTING

* this copefully will fix comments gif

* chore: add note about lazy loading

* chore(readme): at this point there is no code from go.nvim or iferr

* chore(readme): update the structure

* chore(readme): change wording of some things

spec/unit/config_test.lua

@@ -0,0 +1,22 @@
+local t = require "spec.testutils"
+local _, T, config = t.setup "config"
+
+config["can be called without any arguments passed"] = function()
+  ---@diagnostic disable-next-line: missing-parameter
+  require("gopher").setup()
+end
+
+config["can be called with empty table"] = function()
+  require("gopher").setup {}
+end
+
+config["should change option"] = function()
+  local log_level = 1234567890
+  require("gopher").setup {
+    log_level = log_level,
+  }
+
+  t.eq(log_level, require("gopher.config").log_level)
+end
+
+return T