Allow qualified arns for event source mapping for snapstart and provisioned concurrency

[FarhanSajid1]

Description

For some lambda functions there is a use case for using a feature called snapstart or provisioned concurrency both have the following requirement

You can use SnapStart only on [published function versions](https://docs.aws.amazon.com/lambda/latest/dg/configuration-versions.html#configuration-versions-config) and [aliases](https://docs.aws.amazon.com/lambda/latest/dg/configuration-aliases.html) that point to versions. You can't use SnapStart on a function's unpublished version ($LATEST).

You cannot use provisioned concurrency with the $LATEST version of any function.

In addition, if you're using an event source with your Lambda function, make sure that event source points to the correct alias or version. Otherwise, your function won't use provisioned concurrency environments.

A common setup is to have Lambdas be triggered from event sources like SQS, S3, Firehose, etc. The current code has the following logic

resource "aws_lambda_event_source_mapping" "this" {
  for_each = { for k, v in var.event_source_mapping : k => v if local.create && var.create_function && !var.create_layer && var.create_unqualified_alias_allowed_triggers }

  function_name = aws_lambda_function.this[0].arn

The function_name will always use the unqualified arn, which is essentially using $LATEST. And as such, snapstart and provisioned concurrency will never be enabled.

We can add a backwards compatible flag for event sources that will specify if the qualified version is required for the integration

resource "aws_lambda_event_source_mapping" "this" {
  for_each = { for k, v in var.event_source_mapping : k => v if local.create && var.create_function && !var.create_layer && var.create_unqualified_alias_allowed_triggers }

  function_name = try(each.value.require_qualified_name, false) ? aws_lambda_function.this[0].qualified_arn : aws_lambda_function.this[0].arn

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