new variant for ->

[yam-liu]

• The requested variant shape does not go too far away from Iosevka's design.
• The requested variant does not conflict with any characters in Unicode that Iosevka currently supports.
• For each variant you requested, there are at least two monospace/programming fonts created by different designers supported the requested variant. Provide images below.

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Please provide your justification here.

I want to recommend a new style for ->. It is implemented in PragmataPro and Another one(forgot the name). And this keeps the style consistent for -> and =>.