feat: OCR model for remote KServe v2 API (#3189)

* feat: add KServe v2 OCR engine with mixin refactoring

Signed-off-by: Christoph Auer <cau@zurich.ibm.com>

* Add kserve_v2_ocr as default in factory

Signed-off-by: Christoph Auer <cau@zurich.ibm.com>

* Modify batch dimension handling

Signed-off-by: Christoph Auer <cau@zurich.ibm.com>

* Modify batch dimension handling again

Signed-off-by: Christoph Auer <cau@zurich.ibm.com>

* Add BYTES support to KServe v2 client

Signed-off-by: Christoph Auer <cau@zurich.ibm.com>

* Add debug logging

Signed-off-by: Christoph Auer <cau@zurich.ibm.com>

* Reduce scale to 2.0

Signed-off-by: Christoph Auer <cau@zurich.ibm.com>

* Revert debug logging

Signed-off-by: Christoph Auer <cau@zurich.ibm.com>

* chore: Code comments

Signed-off-by: Nikos Livathinos <nli@zurich.ibm.com>

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Signed-off-by: Christoph Auer <cau@zurich.ibm.com>
Signed-off-by: Nikos Livathinos <nli@zurich.ibm.com>
Co-authored-by: Nikos Livathinos <nli@zurich.ibm.com>