feat(pack): add csharp support with omnisharp (#1241)

feat(cs-omnisharp): add csharp support with omnisharp

lua/astrocommunity/pack/cs-omnisharp/README.md

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+# C# Language Pack
+
+**Requirements:** `dotnet` must be in your `PATH` and executable
+
+This plugin pack does the following:
+
+- Adds `c_sharp` Treesitter parsers
+- Adds `omnisharp` language server
+- Adds [`omnisharp-extended-lsp.nvim`](https://github.com/Hoffs/omnisharp-extended-lsp.nvim) for better go to definition/type definition
+- Adds the following `null-ls` sources:
+  - [csharpier](https://github.com/belav/csharpier)
+- Adds `coreclr` debug adapters for nvim-dap

lua/astrocommunity/pack/cs-omnisharp/init.lua

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+return {
+  -- CSharp support
+  {
+    "nvim-treesitter/nvim-treesitter",
+    optional = true,
+    opts = function(_, opts)
+      if opts.ensure_installed ~= "all" then
+        opts.ensure_installed = require("astrocore").list_insert_unique(opts.ensure_installed, { "c_sharp" })
+      end
+    end,
+  },
+  {
+    "jay-babu/mason-null-ls.nvim",
+    optional = true,
+    opts = function(_, opts)
+      opts.ensure_installed = require("astrocore").list_insert_unique(opts.ensure_installed, { "csharpier" })
+    end,
+  },
+  {
+    "williamboman/mason-lspconfig.nvim",
+    optional = true,
+    opts = function(_, opts)
+      opts.ensure_installed = require("astrocore").list_insert_unique(opts.ensure_installed, { "omnisharp" })
+    end,
+  },
+  {
+    "Hoffs/omnisharp-extended-lsp.nvim",
+    dependencies = {
+      {
+        "AstroNvim/astrolsp",
+        opts = {
+          config = {
+            csharp_ls = {
+              handlers = {
+                ["textDocument/definition"] = function(...) require("omnisharp_extended").definition_handler(...) end,
+                ["textDocument/typeDefinition"] = function(...)
+                  require("omnisharp_extended").type_definition_handler(...)
+                end,
+                ["textDocument/references"] = function(...) require("omnisharp_extended").references_handler(...) end,
+                ["textDocument/implementation"] = function(...)
+                  require("omnisharp_extended").implementation_handler(...)
+                end,
+              },
+            },
+          },
+        },
+      },
+    },
+  },
+  {
+    "jay-babu/mason-nvim-dap.nvim",
+    optional = true,
+    opts = function(_, opts)
+      opts.ensure_installed = require("astrocore").list_insert_unique(opts.ensure_installed, { "coreclr" })
+    end,
+  },
+  {
+    "WhoIsSethDaniel/mason-tool-installer.nvim",
+    optional = true,
+    opts = function(_, opts)
+      opts.ensure_installed =
+        require("astrocore").list_insert_unique(opts.ensure_installed, { "omnisharp", "csharpier", "netcoredbg" })
+    end,
+  },
+  {
+    "nvim-neotest/neotest",
+    optional = true,
+    dependencies = { "Issafalcon/neotest-dotnet", config = function() end },
+    opts = function(_, opts)
+      if not opts.adapters then opts.adapters = {} end
+      table.insert(opts.adapters, require "neotest-dotnet"(require("astrocore").plugin_opts "neotest-dotnet"))
+    end,
+  },
+}