feat(cf): CloudFormation stack for DLE deployment (#324)

Cloudformation template (yaml format) to create resources in AWS account, configure and run DLE

Issue: #324 (closed)

TODO

• check wording for fields names and descriptions
• add help link for EC2 sizes
• add help link "how create key pair"
• add default for preload libraries
• replace sleep in userdata with cycle
• check if platform key is needed in template
• check solutions for https and certificate
• do we need to open any ports except 22?
• try to find sandbox for marketplace to evaluate real UX