Add support for tag-like syntax

[jerome-jutteau]

Hi,

We would need to manage tag-like structure:

osc-cli fcu CreateTags --ResourceId i-be1dcf1a --Tag Key=Name,Value=MyValue

Note that it's still possible add tags through:

osc-cli fcu CreateTags --ResourceId i-be1dcf1a --Tag.1.Key=Name --Tag.1.Value=MyValue

Thanks