Feat: add code_executor_manager (#7814)

### What problem does this PR solve?

Add code_executor_manager. #4977.

### Type of change

- [x] New Feature (non-breaking change which adds functionality)

sandbox/executor_manager/util.py

@@ -0,0 +1,76 @@
+#
+#  Copyright 2025 The InfiniFlow Authors. All Rights Reserved.
+#
+#  Licensed under the Apache License, Version 2.0 (the "License");
+#  you may not use this file except in compliance with the License.
+#  You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+#  Unless required by applicable law or agreed to in writing, software
+#  distributed under the License is distributed on an "AS IS" BASIS,
+#  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+#  See the License for the specific language governing permissions and
+#  limitations under the License.
+#
+import os
+import re
+
+
+def is_enabled(value: str) -> bool:
+    return str(value).strip().lower() in {"1", "true", "yes", "on"}
+
+
+def env_setting_enabled(env_key: str, default: str = "false") -> bool:
+    value = os.getenv(env_key, default)
+    return is_enabled(value)
+
+
+def is_valid_memory_limit(mem: str | None) -> bool:
+    """
+    Return True if the input string is a valid Docker memory limit (e.g. '256m', '1g').
+    Units allowed: b, k, m, g (case-insensitive).
+    Disallows zero or negative values.
+    """
+    if not mem or not isinstance(mem, str):
+        return False
+
+    mem = mem.strip().lower()
+
+    return re.fullmatch(r"[1-9]\d*(b|k|m|g)", mem) is not None
+
+
+def parse_timeout_duration(timeout: str | None, default_seconds: int = 10) -> int:
+    """
+    Parses a string like '90s', '2m', '1m30s' into total seconds (int).
+    Supports 's', 'm' (lower or upper case). Returns default if invalid.
+    '1m30s' -> 90
+    """
+    if not timeout or not isinstance(timeout, str):
+        return default_seconds
+
+    timeout = timeout.strip().lower()
+
+    pattern = r"^(?:(\d+)m)?(?:(\d+)s)?$"
+    match = re.fullmatch(pattern, timeout)
+    if not match:
+        return default_seconds
+
+    minutes = int(match.group(1)) if match.group(1) else 0
+    seconds = int(match.group(2)) if match.group(2) else 0
+    total = minutes * 60 + seconds
+
+    return total if total > 0 else default_seconds
+
+
+def format_timeout_duration(seconds: int) -> str:
+    """
+    Formats an integer number of seconds into a string like '1m30s'.
+    90 -> '1m30s'
+    """
+    if seconds < 60:
+        return f"{seconds}s"
+    minutes, sec = divmod(seconds, 60)
+    if sec == 0:
+        return f"{minutes}m"
+    return f"{minutes}m{sec}s"