feat(bazel): add Bazel plugins and completion

Add vim-bazel (with its vim-maktaba dependency) and bazel.nvim for
running Bazel from the editor, with an errorformat that sends Bazel
build and test failures to the quickfix list. cmp-bazel supplies a
Bazel completion source, wired into blink.cmp through blink.compat.
lazy-lock.json pins the five new plugins.

lua/plugins/bazel.lua

@@ -0,0 +1,68 @@
+return {
+  { "bazelbuild/vim-bazel", dependencies = { "google/vim-maktaba" } },
+  {
+    "saghen/blink.cmp",
+    dependencies = { "saghen/blink.compat", { "alexander-born/cmp-bazel", dependencies = "hrsh7th/nvim-cmp" } },
+    opts = {
+      sources = {
+        compat = { "bazel" },
+      },
+    },
+  },
+  {
+    "alexander-born/bazel.nvim",
+    config = function()
+      -- Info: to make tab completion work copy '/etc/bash_completion.d/bazel-complete.bash' to '/etc/bash_completion.d/bazel'
+
+      vim.g.bazel_config = vim.g.bazel_config or ""
+      vim.g.bazel_cmd = "bazel"
+
+      vim.cmd([[
+        set errorformat=ERROR:\ %f:%l:%c:%m
+        set errorformat+=%f:%l:%c:%m
+        set errorformat+=[\ \ FAILED\ \ ]\ %m\ (%.%#
+
+        " Ignore build output lines starting with INFO:, Loading:, or [
+        set errorformat+=%-GINFO:\ %.%#
+        set errorformat+=%-GLoading:\ %.%#
+        set errorformat+=%-G[%.%#
+
+        " Errorformat settings
+        " * errorformat reference: http://vimdoc.sourceforge.net/htmldoc/quickfix.html#errorformat
+        " * look for message without consuming: https://stackoverflow.com/a/36959245/10923940
+        " * errorformat explanation: https://stackoverflow.com/a/29102995/10923940
+
+        " Ignore this error message, it is always redundant
+        " ERROR: <filename>:<line>:<col>: C++ compilation of rule '<target>' failed (Exit 1)
+        set errorformat+=%-GERROR:\ %f:%l:%c:\ C++\ compilation\ of\ rule\ %m
+        set errorformat+=%tRROR:\ %f:%l:%c:\ %m   " Generic bazel error handler
+        set errorformat+=%tARNING:\ %f:%l:%c:\ %m " Generic bazel warning handler
+        " this rule is missing dependency declarations for the following files included by '<another-filename>'
+        "   '<fname-1>'
+        "   '<fname-2>'
+        "   ...
+        set errorformat+=%Ethis\ rule\ is\ %m\ the\ following\ files\ included\ by\ \'%f\':
+        set errorformat+=%C\ \ \'%m\'
+        set errorformat+=%Z
+
+        " Test failures
+        set errorformat+=FAIL:\ %m\ (see\ %f)            " FAIL: <test-target> (see <test-log>)
+
+        " test failures in async builds
+        set errorformat+=%E%*[\ ]FAILED\ in%m
+        set errorformat+=%C\ \ %f
+        set errorformat+=%Z
+
+        " Errors in the build stage
+        set errorformat+=%f:%l:%c:\ fatal\ %trror:\ %m         " <filename>:<line>:<col>: fatal error: <message>
+        set errorformat+=%f:%l:%c:\ %trror:\ %m                " <filename>:<line>:<col>: error: <message>
+        set errorformat+=%f:%l:%c:\ %tarning:\ %m              " <filename>:<line>:<col>: warning: <message>
+        set errorformat+=%f:%l:%c:\ note:\ %m                  " <filename>:<line>:<col>: note: <message>
+        set errorformat+=%f:%l:%c:\ \ \ requ%tred\ from\ here  " <filename>:<line>:<col>: <message>
+        set errorformat+=%f(%l):\ %tarning:\ %m                " <filename>(<line>): warning: <message>
+        set errorformat+=%f:%l:%c:\ %m                         " <filename>:<line>:<col>: <message>
+        set errorformat+=%f:%l:\ %m                            " <filename>:<line>: <message>
+        ]])
+    end,
+  },
+}