create dictionary reader config and default unsafeflag to false

[Rich-T-kid]

Which issue does this PR close?

• Closes Flight skip_validation should apply to dictionary batches #10255.

Rationale for this change

FlightDataDecoder.skip_validation does not get propagated to arrow_ipc::reader::read_dictionary(), the flag is hardcoded to false. This causes validation checks even when this isn't what the caller wants.

What changes are included in this PR?

commit #/1:

• new arrow_ipc::reader::DictionaryConfig thats holds the message version as well as the unsafeFlag
• DictionaryConfig contains a builder method to set skip_validation this gets passed into read_dictionary_impl for reads
• Breaking API change for downstream consumers
• see create dictionary reader config and default unsafeflag to false #10260 (comment)

Are these changes tested?

yes.

Are there any user-facing changes?

view #10260 (comment)

[Rich-T-kid]

Two approaches are split between the two commits

commit #1: Introduce a new struct that holds metadata_version as well as the unsafeFlag. pass this to arrow-ipc::reader::read_dictionary(). this would be a breaking API change

commit #2: expose arrow_ipc::reader::read_dictionary_impl directly so that the unsafe flag can be called directly. this is not a breaking API change

I'm happy to go with either approach depending on what the maintainers think is more appropriate.