eval/typval: Log list actions

New logging is guarded by cmake LOG_LIST_ACTIONS define. To make it more
efficient it is allocated as a linked list with chunks of length
2^(7+chunk_num); that uses basically the same idea as behind increasing kvec
length (make appending O(1) (amortized)), but reduces constant by not bothering
to move memory around what realloc() would surely do: it is not like we need
random access to log entries here to justify usage of a single continuous memory
block.

src/nvim/eval.lua

@@ -313,6 +313,7 @@ return {
     tempname={},
     termopen={args={1, 2}},
     test_garbagecollect_now={},
+    test_write_list_log={args=1},
     timer_info={args={0,1}},
     timer_pause={args=2},
     timer_start={args={2,3}},