feat(terminal-integration): add toggleterm-manager.nvim (#959)

---------

Co-authored-by: Micah Halter <micah@mehalter.com>

lua/astrocommunity/terminal-integration/toggleterm-manager-nvim/README.md

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+# toggleterm-manager.nvim
+
+A Telescope extension to manage Toggleterm's terminals in NeoVim
+
+Key `<Leader>ts` is mapped to open the telescope interface.
+
+Additionally added keymaps in the Telescope interface:
+
+- `n` normal mode:
+  - `<CR>`: toggle the selected terminal.
+  - `r`: rename the selected terminal.
+  - `d`: delete the selected terminal.
+  - `n`: create a new terminal buffer
+- `i` insert mode:
+  - `<CR>`: toggle the selected terminal.
+  - `<C-r>`: rename the selected terminal.
+  - `<C-d>`: delete the selected terminal.
+  - `<C-i>`: create a new terminal buffer
+
+**Repository:** <https://github.com/ryanmsnyder/toggleterm-manager.nvim>

lua/astrocommunity/terminal-integration/toggleterm-manager-nvim/init.lua

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+return {
+  "ryanmsnyder/toggleterm-manager.nvim",
+  lazy = true,
+  init = function(plugin) require("astrocore").on_load("telescope.nvim", plugin.name) end,
+  dependencies = {
+    "akinsho/toggleterm.nvim",
+    "nvim-telescope/telescope.nvim",
+    "nvim-lua/plenary.nvim",
+    {
+      "AstroNvim/astrocore",
+      opts = {
+        mappings = {
+          n = {
+            ["<Leader>ts"] = { "<cmd>Telescope toggleterm_manager<cr>", desc = "Search Toggleterms" },
+          },
+        },
+      },
+    },
+  },
+  opts = function(_, opts)
+    local term_icon = require("astroui").get_icon "Terminal"
+    local toggleterm_manager = require "toggleterm-manager"
+    local actions = toggleterm_manager.actions
+
+    return require("astrocore").extend_tbl(opts, {
+      titles = { prompt = term_icon .. " Terminals" },
+      results = { term_icon = term_icon },
+      mappings = {
+        n = {
+          ["<CR>"] = { action = actions.toggle_term, exit_on_action = true }, -- toggles terminal open/closed
+          ["r"] = { action = actions.rename_term, exit_on_action = false }, -- provides a prompt to rename a terminal
+          ["d"] = { action = actions.delete_term, exit_on_action = false }, -- deletes a terminal buffer
+          ["n"] = { action = actions.create_term, exit_on_action = false }, -- creates a new terminal buffer
+        },
+      },
+    })
+  end,
+}