fix: rename server_configurations -> configs

[mehalter]

A couple hours ago nvim-lspconfig just did a big refactor that renames the server_configurations modules to configs: neovim/nvim-lspconfig#3330

This applies the rename here so that mason-lspconfig still functions. It is worth noting that require("lspconfig.configs") is still the same as before, it's just the default server configurations are now "lspconfig.configs.<server_name>".

Another small change was moving from :format() to string concatenation. This isn't a huge deal, but in Lua simple string concatenation is marginally faster than string format.

Once this is merged in it is probably a good idea to do a quick patch version release for people who are tracking official releases since this is a pretty big breaking change 😄

EDIT: Also applied changes necessary for other big changes/refactors in nvim-lspconfig in the past couple weeks. Total list of upstream PRs this takes into account:

• feat(als): remove als from server_configurations neovim/nvim-lspconfig#3310
• fix: remove all javascript dialects from stylelint_lsp filetypes neovim/nvim-lspconfig#3324
• refactor: rename "server_configurations" => "configs" neovim/nvim-lspconfig#3330
• fix(harper_ls): filetype "csharp" -> "cs" neovim/nvim-lspconfig#3358
• Removes support for Neovim <0.9. This is also just following suit with nvim-lspconfig since all the tests break. Once a v2.0 release is tagged here then people using an older version can simply use the last release here which also supports the last release of nvim-lspconfig with 0.7-0.8 support

Closes #469

[mehalter]

neovim/nvim-lspconfig#3310

looks like als was also removed a couple weeks ago as well. I'll look into getting that resolved here as well.

[mehalter]

The only thing left to do here really is to decide if mason-lspconfig should also reflect these changes regarding server_configurations -> configs. I'll do a push with this refactor because I think over time it seems most logical to mirror the nvim-lspconfig structure, but if you want to keep it as before then I can easily revert that one change.

EDIT: I reverted this change because it completely broke the tests and I'm not familiar enough with the code base to identify the issue immediately. I'll leave applying that change to you if you want to mirror the upstream resolved

[mehalter]

@williamboman sorry for the extra ping, I just wanted to see if this could get reviewed. Especially with the new neovim version release today I suspect a lot of people might be updating their configurations and this plugin will stop working in some regards with the changes to lspconfig

[jack-obrien]

Also, all the links in README.md need to get updated to point towards configs.md instead of server_configurations.md

[mehalter]

Also, all the links in README.md need to get updated to point towards configs.md instead of server_configurations.md

Don't worry, that's already done in this PR :)

[williamboman]

Thanks and sorry for late review. I reverted the nvim 0.9.0 upgrade (which makes total sense, I'll add in a different PR for better changelog) and the mason-lspconfig module rename (I don't think this is necessary, might even be a breaking change to a handful users who override these modules).

[williamboman]

Oh nvim-lspconfig has a hard dependency on nvim 0.9, let me merge the nvim version requirement upgrade first and rebase

[mehalter]

Thanks so much! Let me know if you want me to do anything else on this or if you want to handle the merging and stuff finishing up the rest of this. Glad to help contribute 😄