clickhouse: Split existing package into lts.nix and generic.nix

pkgs/by-name/cl/clickhouse/lts.nix

···
+import ./generic.nix {
+  version = "25.3.5.42-lts";
+  hash = "sha256-LvGl9XJK6Emt7HnV/Orp7qEmJSr3TBJZtApL6GrWIMg=";
+  lts = true;
+}

pkgs/by-name/cl/clickhouse/package.nix pkgs/by-name/cl/clickhouse/generic.nix

···
+{
+  lts ? false,
+  version,
+  hash,
+}:
+
 {
   lib,
   stdenv,
···
 }:
 
 llvmPackages_19.stdenv.mkDerivation (finalAttrs: {
-  pname = "clickhouse";
-  version = "25.3.5.42";
+  pname = "clickhouse" + lib.optionalString lts "-lts";
+  inherit version;
 
   src = fetchFromGitHub rec {
     owner = "ClickHouse";
     repo = "ClickHouse";
-    tag = "v${finalAttrs.version}-lts";
+    tag = "v${finalAttrs.version}";
     fetchSubmodules = true;
     name = "clickhouse-${tag}.tar.gz";
-    hash = "sha256-LvGl9XJK6Emt7HnV/Orp7qEmJSr3TBJZtApL6GrWIMg=";
+    inherit hash;
     postFetch = ''
       # delete files that make the source too big
       rm -rf $out/contrib/llvm-project/llvm/test

pkgs/top-level/all-packages.nix

···
 
   ckb-next = libsForQt5.callPackage ../tools/misc/ckb-next { };
 
+  clickhouse-lts = callPackage ../by-name/cl/clickhouse/lts.nix { };
+
   cmdpack = callPackages ../tools/misc/cmdpack { };
 
   cocoapods = callPackage ../development/tools/cocoapods { };