feat(debugging): Add nvim-chainsaw (#739)

lua/astrocommunity/debugging/nvim-chainsaw/README.md

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+# nvim-chainsaw
+
+Speed up log creation. Create various kinds of language-specific log statements, such as logs of variables, assertions, or time-measuring.
+
+**Note:** We do not expose any keys or mappings. Please see the [Usage](https://github.com/chrisgrieser/nvim-chainsaw#usage) section of the plugin docs.
+
+**Repository:** <https://github.com/chrisgrieser/nvim-chainsaw>

lua/astrocommunity/debugging/nvim-chainsaw/init.lua

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+---@type LazySpec
+return { "chrisgrieser/nvim-chainsaw", opts = {} }