Fix arithmetic coercion - refactored and enhanced (#1576)

The Lua 5.4 compatible `tonumber` implementation completely reworked

- custom char-by-char parser (no regexes)
- proper Lua space handling
- support for heximal integers and floats
- support for scientific float notation
- extended tests
- updated website docs

Signed-off-by: Matouš Jan Fialka <mjf@mjf.cz>

client/space_lua/lua.test.ts

@@ -13,6 +13,10 @@ Deno.test("[Lua] Table tests", async () => {
   await runLuaTest("./stdlib/table_test.lua");
 });
 
+Deno.test("[Lua] String to number tests", async () => {
+  await runLuaTest("./tonumber_test.lua");
+});
+
 Deno.test("[Lua] String tests", async () => {
   await runLuaTest("./stdlib/string_test.lua");
   // await runLuaTest("./stdlib/string_test2.lua");