[Storage] IPv6 Connection String

[mithoAzure]

Describe the bug
When using IPv6 connection string for storage it does not follow RFC, it attempts to parse the first : as start of port. In the case of ipv6 it should detect "[]" and recognize any : within as part of the host string

Exception or Stack Trace
errors on "stoi"

To Reproduce
use any ipv6 address in connection string

Code Snippet
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Expected behavior
parse host and port correctly in ipv6 case

Screenshots
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Setup (please complete the following information):

• OS: [e.g. iOS] Azure Linux 3.0
• IDE : [e.g. IntelliJ]
• Version of the Library used

Additional context
Some services connect to blob using ipv6 raw address, also used in testing against Azurite

Information Checklist
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