[CHANGE] Tags are now case-sensitive

[aricart]

Previous versions of the library lowercased all tags. Now tags such as "A" and "a" are different.

[aricart]

this enables use of tags macros for more complex conditions where mixed case values are possible see nats-io/nats-server#5681

[coveralls]

Pull Request Test Coverage Report for Build 10837995316

Details

• 30 of 43 (69.77%) changed or added relevant lines in 1 file are covered.
• 1 unchanged line in 1 file lost coverage.
• Overall coverage decreased (-0.1%) to 80.994%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
v2/types.go	30	43	69.77%

Files with Coverage Reduction	New Missed Lines	%
v2/types.go	1	86.08%

Totals
Change from base Build 10801439726:	-0.1%
Covered Lines:	2753
Relevant Lines:	3399

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💛 - Coveralls

[ripienaar]

LGTM, question on the other PR about impact

[aricart]

@ripienaar as discussed, changing the client (nsc) to have a flag that verifies the intention to be case sensitive - if input is detected on nsc that doesn't match lowercased version of the value, nsc will reject the edit and request for the case sensitive flag to be provided.