Add new files for synthetic flow study in OO

[abmodak]

In this PR, I have added macros for synthetic flow study in OO collisions as discussed in O2-6641. The macros are similar to what was used in case of Pb-Pb system O2-5544.

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[njacazio]

Ciao @abmodak you need to have the test macro defined

[abmodak]

Ciao @njacazio, thanks for your comment! I have added the test macro and made some changes in the other files.
Can you please check and approve the PR?

Thanks,
Abhi

[abmodak]

Ciao @njacazio, can you please approve the PR again? There was an issue with the CCDB path, which is fixed now.

Many thanks,
Abhi