tests: Add escaped quotes tests for REPL.

Test possible combinations of single and double quotes with escaped
quotes and parenthesis with and without function calls in REPL.

Covers: #1419

tests/cmdline/repl_cont.py

 # check REPL allows to continue input
 1 \
 + 2
+'"'
+"'"
+'\''
+"\""
+'\'('
+"\"("
+print("\"(")
+print('\'(')
+print("\'(")
+print('\"(')
 'abc'
 "abc"
 '''abc

tests/cmdline/repl_cont.py.exp

@@ -3,6 +3,26 @@ Micro Python \.\+ version
 >>> 1 \\\\
 ... + 2
 3
+>>> '"'
+'"'
+>>> "'"
+"'"
+>>> '\\\\''
+"'"
+>>> "\\\\""
+'"'
+>>> '\\\\'('
+"'("
+>>> "\\\\"("
+'"('
+>>> print("\\\\"(")
+"(
+>>> print('\\\\'(')
+'(
+>>> print("\\\\'(")
+'(
+>>> print('\\\\"(')
+"(
 >>> 'abc'
 'abc'
 >>> "abc"