feat(core.ui): let create_split take in a height variable

lua/neorg/modules/core/ui/module.lua

@@ -105,11 +105,13 @@ module.public = {
 
     ---Creates a new horizontal split at the bottom of the screen
     ---@param  name string the name of the buffer contained within the split (will have neorg:// prepended to it)
-    ---@param  config table a table of <option> = <value> keypairs signifying buffer-local options for the buffer contained within the split
-    create_split = function(name, config)
+    ---@param  config table? a table of <option> = <value> keypairs signifying buffer-local options for the buffer contained within the split
+    ---@param  height number? the height of the new split
+    create_split = function(name, config, height)
         vim.validate({
             name = { name, "string" },
             config = { config, "table", true },
+            height = { height, "number", true },
         })
 
         local bufname = "neorg://" .. name
@@ -121,6 +123,10 @@ module.public = {
 
         vim.cmd("below new")
 
+        if height then
+            vim.api.nvim_win_set_height(0, height)
+        end
+
         local buf = vim.api.nvim_win_get_buf(0)
 
         local default_options = {