feat(lsp): add lsp-inlayhints plugin

lua/astrocommunity/lsp/lsp-inlayhints-nvim/README.md

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+# lsp-inlayhints.nvim
+
+**Repository:** https://github.com/lvimuser/lsp-inlayhints.nvim
+
+Partial implementation of LSP inlay hint.

lua/astrocommunity/lsp/lsp-inlayhints-nvim/lsp-inlayhints.lua

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+return {
+  "lvimuser/lsp-inlayhints.nvim",
+  init = function()
+    vim.api.nvim_create_autocmd("LspAttach", {
+      group = vim.api.nvim_create_augroup("LspAttach_inlayhints", {}),
+      callback = function(args)
+        if not (args.data and args.data.client_id) then return end
+        local client = vim.lsp.get_client_by_id(args.data.client_id)
+        if client.server_capabilities.inlayHintProvider then require("lsp-inlayhints").on_attach(client, args.buf) end
+      end,
+    })
+  end,
+  opts = {},
+}