feat: add missing attributes to launch template, remove null resource for tag propagation, propagate default tags to instances, allow propagated name to be set independently of ASG

[bryantbiggs]

Description

• Add additional attributes that have been added to the launch template specification lately
• Remove the null resource for updating propagated tags; replace with a list comprehension expression that achieves the same result
• Add default tags data source and add in default tags to propagated tags: closes #162
• Add new variable instance_name that allows users to set the propagated instance name independently of the ASG var.name; if not specified it defaults to current var.name: closes #158
• Make the attribute block_duration_minutes option under spot_options - this is still supported in the AWS provider but by making this optional it will fix/close #156

Motivation and Context

• Closes #156
• Closes #158
• Closes #162

Breaking Changes

No, but users will see some updates in their plans with the switch from null resource to list comprehension of propagated tags

# module.complete_lc.null_resource.tags_as_list_of_maps[0] will be destroyed
  - resource "null_resource" "tags_as_list_of_maps" {
      - id       = "4889299483352056787" -> null
      - triggers = {
          - "key"                 = "Environment"
          - "propagate_at_launch" = "true"
          - "value"               = "dev"
        } -> null
    }

How Has This Been Tested?

• [x] I have tested and validated these changes using one or more of the provided examples/* projects
  • Launched complete example on master and switched to this branch and verified changes and diffs

[bryantbiggs]

@antonbabenko this one should be ready if you have some time

[antonbabenko]

This PR is included in version 4.9.0 :tada:

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