Add missing implicit method from contract to interface

[0xjei]

Description

This PR adds the missing groupCounter() implicit method from Semaphore contract to ISemaphore contract interface. This will enable anyone to use this method just from the interface.

Related Issue(s)

none

Other information

this does not anything - gas costs included.

Checklist

• [x] My code follows the style guidelines of this project
• [x] I have performed a self-review of my code
• [x] I have commented my code, particularly in hard-to-understand areas
• [x] My changes generate no new warnings
• [x] I have run yarn format and yarn lint without getting any errors
• [ ] I have added tests that prove my fix is effective or that my feature works
• [x] New and existing unit tests pass locally with my changes

[openzeppelin-code[bot]]

Add missing implicit method from contract to interface

Generated at commit: e8c5f7aa816b67931cdcbfa9ca21a15d2130d475

🚨 Report Summary

	Severity Level	Results
Contracts	Critical High Medium Low Note Total	0 0 0 4 15 19
Dependencies	Critical High Medium Low Note Total	0 0 0 0 0 0

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For more details view the full report in OpenZeppelin Code Inspector