fix: debugger now also supports dictionary expressions

given this example:

```robot
*** Variables ***
&{DICTIONARY_EXAMPLE1}      output_dir=${OUTPUT DIR}
...                         AA=${DUT_IP_ADDRESS_1}
...                         ZZ=${{{1:2, 3:4}}}
```

now you can also evaluate expressions like

```
${DICTIONARY_EXAMPLE1}[output_dir]
```

in the debugger.

Author: d-biehl

robotcode/debugger/debugger.py

@@ -1184,7 +1184,7 @@ def get_variables(
 
         return list(result.values())
 
-    IS_VARIABLE_RE = re.compile(r"^[$@&%]\{.*\}$")
+    IS_VARIABLE_RE = re.compile(r"^[$@&%]\{.*\}(\[[^\]]*\])?$")
     IS_VARIABLE_ASSIGNMENT_RE = re.compile(r"^[$@&%]\{.*\}=?$")
     SPLIT_LINE = re.compile(r"(?= {2,}| ?\t)\s*")
     CURRDIR = re.compile(r"(?i)\$\{CURDIR\}")
@@ -1200,7 +1200,7 @@ def evaluate(
         from robot.running.context import EXECUTION_CONTEXTS
         from robot.running.model import Keyword
         from robot.variables.evaluation import evaluate_expression
-        from robot.variables.finders import VariableFinder
+        from robot.variables.replacer import VariableReplacer
 
         if not expression:
             return EvaluateResult(result="")
@@ -1271,7 +1271,7 @@ def run_kw() -> Any:
 
             elif self.IS_VARIABLE_RE.match(expression.strip()):
                 try:
-                    result = VariableFinder(vars.store).find(expression)
+                    result = VariableReplacer(vars.store).replace_scalar(expression)
                 except VariableError:
                     if context is not None and (
                         isinstance(context, EvaluateArgumentContext)