[TT-8392] Add extra volumes and extra volume mounts support

[zalbiraw]

Add support for extraVolumes and extraVolumeMounts to allow users to mount volumes to our containers

Also fixes the extraEnvs and add support for yaml based input rather than key, value pairs

Solves
#246
#261

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• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

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