Add optional _preprocess hook to SingleTaskLearning class

[anshRastogi02]

What type of PR is this?
Adds a no-op _preprocess method

What this PR does / why we need it:
It allow optional dataset preparation, maintaining modularity for downstream agents.
Which issue(s) this PR fixes:

Related to: #208

Fixes #208

[kubeedge-bot]

Welcome @anshRastogi02! It looks like this is your first PR to kubeedge/ianvs 🎉

[kubeedge-bot]

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[IcyFeather233]

Thank you for your interest in Ianvs! This issue was identified during another project and has already been resolved in another PR, which hasn’t been merged yet, so there’s no need to submit a separate PR for this. Nevertheless, we greatly appreciate your attention! If you’re interested in Ianvs, you’re welcome to contribute to improving other aspects of the code.

[AryanNanda17]

@IcyFeather233, can you please point to your PR that solves the same issue that this PR is solving?

We can then close this issue. Thanks.
cc @MooreZheng

[AryanNanda17]

@IcyFeather233, can you please point to your PR that solves the same issue that this PR is solving?

We can then close this issue. Thanks. cc @MooreZheng

cc @IcyFeather233