C and C++ only had Treesitter highlighting. The extra adds clangd,
clangd_extensions.nvim, the cpp parser and a codelldb debug config;
lazy-lock.json pins clangd_extensions.nvim.
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.