Macro: System should allow '*' symbol at the beginning of peptide sequence

[AlexeyGirin]

Steps to Reproduce

1. Switch to Macromolecules mode
2. Load by Paste from Clipboard as FASTA - Peptide the following:

>That should be allowed
*AAAA

Actual behavior
System throws an error: Convert error! Given string could not be loaded as (query or plain) molecule or reaction, see the error messages

Expected behavior
System loads peptide without errors

As per requirement description (epam/Indigo#1755 (comment)):

"*" means the end of the peptide sequence
If " * " occurred between two letters then it should be recognized as the break in peptide chain (no bond should be created between monomers separated with the "*").
Confirmed by @olganaz

Environment details:
Ketcher Version 2.20.0-rc.2 Build at 2024-03-27; 08:30:51
Indigo Toolkit Version 1.19.0-rc.2.0-g6c0e3fecf-x86_64-linux-gnu-11.2.1
Win10
Chrome Version 122.0.6261.129 (Official Build) (64-bit)

Related issues:

• Import and export fasta format for RNA, DNA and PEPTIDES Indigo#1755
• Autotests: Macro: UI for Open/Save As FASTA/Sequence #4280

[AlexeyGirin]

Moved to Refined Backlog since not fixed over 1 release