Incorrect escaping in strings

[StrekoZ]

Describe the bug
Incorrect escping of backslash

To Reproduce

1. Open playground: https://camunda.github.io/feel-scala/docs/playground/
2. Use expression x = "\\"
3. Use context { "x": "\\" }

Observed behavior

Expected behavior
Output should be true

Notes
If expression is x, then in output there is string with 2 slashes instead of one
If expression is "\\" then currently output is string with 4 slashes, which is very srange

Environment

• FEEL engine version: [1.17]

[StrekoZ]

Similar problem described at: #778 (slightly different use case, but also related to backslash and escaping)

[saig0]

@StrekoZ thank you for reporting. 👍