Single Lambda Airnode

[aTeoke]

Implement a single Lambda Airnode that is able to do provider initialisation, API calling and fulfilment all in the same Lambda. The best approach "how" needs to be discovered and discussed during the implementation. Slack discussion for reference here

Allow user to configurate the Lambda's memory size

Test how many requests can be handled by a Lambda of a specific memory size

• e.g. 10 requests per minute - 512 MB of memory
• test for additional 5,20,60 - and add this to the documentation as well for the user to have rough idea

[bbenligiray]

This should include allowing the user to configure the memory size of that single Lambda

[aTeoke]

as discussed on weekly planning, pushing to v0.12