Structure Aware Tag Fuzz Target

[spellfish]

Adds Basic Structure Aware Fuzzing for tag_imap:

• TagInput: A struct representing the input for the fuzz target.
• Arbitrary Implementation: This allows TagInput to be generated with random values.
• Conversion to Bytes: Converts the input string to bytes.
• Parsing: Attempts to parse the input bytes as an IMAP tag using tag_imap.
• Currently does not specify additional checks in the even of a parsing failure.

[coveralls]

Pull Request Test Coverage Report for Build 9333970934

Details

• 0 of 14 (0.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.1%) to 92.348%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
imap-codec/src/core.rs	0	14	0.0%
<!--	Total:	0	14	0.0%	-->

Totals
Change from base Build 9333804753:	-0.1%
Covered Lines:	9993
Relevant Lines:	10821

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💛 - Coveralls