nixos-option: clean up includes based on clang-tidy suggestions

Before the code was using include-what-you-means, but it's a bit tricky
to integrate this in nix. I had some trouble with nix-eval-jobs when using include-what-you-means.
clang-tidy on the other hand proved more robust to me and is useful for linting in general,
so less tooling overall for this little project.

pkgs/tools/nix/nixos-option/.clang-tidy

@@ -1,4 +1,6 @@
 Checks:
+- -*
+- misc-include-cleaner
 # TODO
 #  - bugprone-*
 #  - performance-*

pkgs/tools/nix/nixos-option/src/libnix-copy-paste.cc

@@ -2,8 +2,9 @@
 // Since they are not, copy/paste them here.
 // TODO: Delete these and use the ones in the library as they become available.
 
+#include <string_view>
 #include "libnix-copy-paste.hh"
-#include <nix/print.hh>                           // for Strings
+#include <nix/print.hh>
 
 // From nix/src/nix/repl.cc
 bool isVarName(const std::string_view & s)

pkgs/tools/nix/nixos-option/src/libnix-copy-paste.hh

@@ -1,5 +1,5 @@
 #pragma once
 
-#include <nix/types.hh>
+#include <string_view>
 
 bool isVarName(const std::string_view & s);

pkgs/tools/nix/nixos-option/src/nixos-option.cc

@@ -1,20 +1,36 @@
-#include <nix/args.hh>             // for argvToStrings, UsageError
-#include <nix/attr-path.hh>        // for findAlongAttrPath, parseAttrPath
-#include <nix/attr-set.hh>         // for Attr, Bindings, Bindings::iterator
-#include <nix/common-eval-args.hh> // for MixEvalArgs
-#include <nix/eval-gc.hh>          // for initGC, initNix
-#include <nix/eval-inline.hh>      // for EvalState::forceValue
-#include <nix/eval.hh>             // for EvalState, initGC, operator<<
-#include <nix/globals.hh>          // for initPlugins, Settings, settings
-#include <nix/nixexpr.hh>          // for Pos
-#include <nix/shared.hh>           // for getArg, LegacyArgs, printVersion
-#include <nix/store-api.hh>        // for openStore
-#include <nix/symbol-table.hh>     // for Symbol, SymbolTable
-#include <nix/types.hh>            // for Error, Path, Strings, PathSet
-#include <nix/util.hh>             // for absPath, baseNameOf
-#include <nix/value.hh>            // for Value, Value::(anonymous), Value:...
-#include <string>                  // for string, operator+, operator==
-#include <utility>                 // for move
+#include <algorithm>
+#include <cstddef>
+#include <exception>
+#include <functional>
+#include <iostream>
+#include <iterator>
+#include <optional>
+#include <sstream>
+#include <string>
+#include <utility>
+#include <variant>
+#include <vector>
+
+#include <nix/args.hh>
+#include <nix/attr-path.hh>
+#include <nix/attr-set.hh>
+#include <nix/common-eval-args.hh>
+#include <nix/error.hh>
+#include <nix/eval-error.hh>
+#include <nix/eval-gc.hh>
+#include <nix/eval.hh>
+#include <nix/file-system.hh>
+#include <nix/globals.hh>
+#include <nix/nixexpr.hh>
+#include <nix/pos-idx.hh>
+#include <nix/print.hh>
+#include <nix/ref.hh>
+#include <nix/shared.hh>
+#include <nix/store-api.hh>
+#include <nix/symbol-table.hh>
+#include <nix/types.hh>
+#include <nix/value.hh>
+#include <nix/value/context.hh>
 
 #include "libnix-copy-paste.hh"