Support for Fluent Types in Tables

[LieselThuriot]

Background:
Currently, TableStorage allows handling multiple types in blobs using a custom serializer, but table entities don't support this natively. This limits flexibility and type safety when storing heterogeneous entities within the same table.

Proposal:
Instead of creating a new tableset type, introduce three new types in a new project to enable fluent typing in tables:

1. FluentTableEntity<T..TX>

   • Stores multiple types in a single table using a $type field to differentiate entity types.

2. FluentPartitionTableEntity<T..TX>

   • Partition key is set as the $type value, further optimizing queries by type.

3. FluentRowKeyTableEntity<T..TX>

   • Row key is set as the $type value, supporting table designs requiring type-based row identification.

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Benefits:

• Flexible handling of multiple entity types per table
• Leverages existing custom serialization approaches
• Simplifies partitioning and querying by type

Action Items:

• Design and implement FluentTableEntity<T..TX>, FluentPartitionTableEntity<T..TX>, and FluentRowKeyTableEntity<T..TX>
• Document usage patterns and migration strategies
• Add tests and example scenarios for each new type

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Label: enhancement