mime: relax easy/mime structures binding #9927
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Recent changes to the library have released the strict need for an early binding of mime structures to an easy handle.
This constraint currently forces to create the handle before the mime structure and the latter cannot be attached to another handle once created (see https://curl.se/mail/lib-2022-08/0027.html).
This commit removes the handle pointers from the mime structures allowing more flexibility on their use.
When an easy handle is duplicated, bound mime structures must however still be duplicated too as their components hold send-time dynamic information.