Support for SnapStart

[mcopik]

On AWS, Python and Java functions can now start from a snapshot. We should add this as a config flag, remember that this setting is applied, and also add this as an option to the invocation latency benchmark.

[mohammedfirdouss]

@mcopik Can I get started with this? I would love to check it out.

[mohammedfirdouss]

I see there are no links or guide, are you still updating this issue, I would require some assistance.

[mcopik]

@mohammedfirdouss Hi! All docs are available on AWS website: https://docs.aws.amazon.com/lambda/latest/dg/snapstart-activate.html

We should:

• Make it an option of the benchmark (it shouldn't be enabled by default)
• Store this as config of deployed function.
• Implement enabling/disabling of it for AWS.
• Validate that this feature can only be enabled for supported languages (Python/JS)