[Refactor] Initialize class members inside init method

[ishan-modi]

What does this PR do?

Fixes #11002

Who can review?

@DN6 @yiyixuxu

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[ishan-modi]

@DN6, gentle ping

[yiyixuxu]

thanks! I left some questions on how we should determine default

[yiyixuxu]

i would suggest:

1 .default _guidance_scale to be same as each pipeline call default, e.g. 7.5 here

2 _num_stesps can be None here since it is not yet known

but let me know all your thoughts @DN6 @ishan-modi

[github-actions]

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[yiyixuxu]

hi @ishan-modi
are you still available on working on this? if not, we can open this to the community as well

let me know!

[ishan-modi]

Hi @yiyixuxu, thanks for reviving this MR, as requested I have updated guidance_scale in __init__ to match __call__ defaults

let me know if you think it requires any other change