AddBlazoredSessionStorage() add public setter for options.JsonSerializerOptions

[rf-0]

Is your feature request related to a problem? Please describe.
Currently we need to set each JsonSerializerOptions manually independently if we have a static method already defined.

Describe the solution you'd like
Allow for options.JsonSerializerOptions to be set so a static JsonSerializerOptions config can be reused instead of setting each property again.

Describe alternatives you've considered
Currently mapping everything manually (converters etc)

Additional context
Cleaner centralized code.