Add support for realtime log config to ordered_cache

[mschfh]

what

This PR adds realtime log config support for additional cache behaviours (Similar to #162 which added default cache behaviour)

references

162 - Added realtime_log_config_arn for default cache behaviour

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[Benbentwo]

/terratest

[Nuru]

Sorry, @mschfh , it looks like the README needs to be rebuilt. Please run

make init
make readme

and push the updated *.md files.

[mschfh]

@Nuru updated the docs and rebased on main

[Benbentwo]

/terratest