Add DoRA support in KerasHub

[divyashreepathihalli]

[Ajinkya-25]

I would like to open a PR for this feature.

[sachinprasadhs]

@Ajinkya-25 , Thanks, feel free to ask any clarification, I'm assigning this in your name.

[Ajinkya-25]

@sachinprasadhs I can not find optimizers file in keras hub as it is in keras. Where should i add Dora file?

[divyashreepathihalli]

@Ajinkya-25 can you please add a Keras IO example demonstrating DoRA?