eval: context: add ctx-family functions

src/nvim/eval.lua

@@ -74,6 +74,11 @@ return {
     cosh={args=1, func="float_op_wrapper", data="&cosh"},
     count={args={2, 4}},
     cscope_connection={args={0, 3}},
+    ctxget={args={0, 1}},
+    ctxpop={},
+    ctxpush={args={0, 1}},
+    ctxset={args={1, 2}},
+    ctxsize={},
     cursor={args={1, 3}},
     deepcopy={args={1, 2}},
     delete={args={1,2}},