Align series/2.x branch codec generation annotations with zio-schema

[googley42]

zio-dynamodb has been a pioneer in using annotations to customise zio-schema derived codes. However recently zio-schema has introduced standardised annotation names (only in it's ZIO2.X branch) that overlap - so the this issue is to replace our custom ones with standard versions, and also consider implementing new standard annotations that have been added to zio-schema that have no equivalent in zio-dynamodb.

Here is a summary of the new zio-schema annotations and their equivalents in zio-dynamodb:

zio-schema	zio-dynamodb	Notes
@simpleEnum	was @enumOfCaseObjects	Done
@discriminatorName	was @Discriminator	Done
@Fieldname	was @id	Done
@casename	was @id	Done
@fieldNameAliases	TODO
@optionalField	?
@rejectExtraFields	?
@transientfield	?
@fieldDefaultValue	TODO