Add engine_version to modify option at restore from snapshot step

[teraken0509]

Fixes #7723

Changes proposed in this pull request:

• Add setting engine_version to modify options when creating from snapshot restore

Output from acceptance testing:

$ make testacc TEST=./aws TESTARGS='-run=TestAccAWSDBInstance_MySQL_SnapshotRestoreWithEngineVersion'
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./aws -v -parallel 20 -run=TestAccAWSDBInstance_MySQL_SnapshotRestoreWithEngineVersion -timeout 120m
=== RUN   TestAccAWSDBInstance_MySQL_SnapshotRestoreWithEngineVersion
=== PAUSE TestAccAWSDBInstance_MySQL_SnapshotRestoreWithEngineVersion
=== CONT  TestAccAWSDBInstance_MySQL_SnapshotRestoreWithEngineVersion
--- PASS: TestAccAWSDBInstance_MySQL_SnapshotRestoreWithEngineVersion (1929.94s)
PASS
ok  	github.com/terraform-providers/terraform-provider-aws/aws	1930.005s

[bflad]

LGTM, thanks so much @kterada0509 🚀

New acceptance test before code update:

--- FAIL: TestAccAWSDBInstance_MySQL_SnapshotRestoreWithEngineVersion (1388.58s)
    testing.go:538: Step 0 error: Check failed: Check 4/4 error: aws_db_instance.mysql_restore: Attribute 'engine_version' expected "5.6.41", got "5.6.35"

Acceptance test after code update:

--- PASS: TestAccAWSDBInstance_MySQL_SnapshotRestoreWithEngineVersion (1893.36s)

[bflad]

This has been released in version 2.1.0 of the AWS provider. Please see the Terraform documentation on provider versioning or reach out if you need any assistance upgrading.

[ghost]

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