feat: create @call operator

[ologbonowiwi]

Issue Reference(s):
Fixes #846
/claim #846

Build & Testing:

• I ran cargo test successfully.
• I have run ./lint.sh --mode=fix to fix all linting issues raised by ./lint.sh --mode=check.

Checklist:

• I have added relevant unit & integration tests.
• I have updated the documentation accordingly.
• I have performed a self-review of my code.
• PR follows the naming convention of <type>(<optional scope>): <title>

[codecov]

Codecov Report

Attention: Patch coverage is 96.21849% with 9 lines in your changes are missing coverage. Please review.

Project coverage is 88.84%. Comparing base (64f0f71) to head (045d9bd).

Files	Patch %	Lines
src/blueprint/operators/call.rs	95.94%	6 Missing ⚠️
src/blueprint/operators/const_field.rs	95.23%	1 Missing ⚠️
src/blueprint/operators/expr.rs	50.00%	1 Missing ⚠️
src/config/expr.rs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1064      +/-   ##
==========================================
+ Coverage   88.57%   88.84%   +0.27%     
==========================================
  Files         106      107       +1     
  Lines       11997    12193     +196     
==========================================
+ Hits        10626    10833     +207     
+ Misses       1371     1360      -11     

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[github-actions]

Action required: PR inactive for 2 days.
Status update or closure in 5 days.

[github-actions]

Action required: PR inactive for 2 days.
Status update or closure in 5 days.

[tusharmath]

@ologbonowiwi I want to come back to this. Can you resolve conflicts once.

[tusharmath]

Thanks @ologbonowiwi!

Looking forward to it's documentation on the website :)
/tip 100$

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