[Proposal]: String/Character escape sequence \e

# String/Character escape sequence \e

* Specification: https://github.com/dotnet/csharplang/blob/main/proposals/csharp-13.0/esc-escape-sequence.md
* Discussion: https://github.com/dotnet/csharplang/discussions/8656

## Summary
[summary]: #summary

An addition of the string/character escape sequence `\e` as a shortcut/short-hand replacement for the character code point `0x1b`, commonly known as the `ESCAPE` (or `ESC`) character.

## Design meetings

[main/meetings/2023/LDM-2023-10-16.md#stringcharacter-escape-sequence-e-as-a-short-hand-for-u001b-](https://github.com/dotnet/csharplang/blob/main/meetings/2023/LDM-2023-10-16.md#stringcharacter-escape-sequence-e-as-a-short-hand-for-u001b-)