fix(lambda-python): allowPublicSubnet and filesystem not supported (#10022)

Fixes #10018.
Fixes #10027.

#9468 added a flag (`allowPublicSubnet`) to `FunctionProps`, but `PythonFunction` and `NodejsFunction` props derive from `FunctionOptions`. This renders these derived function constructs unable to bypass the public subnet check that occurs in the base `Function` construct. We can resolve this issue by moving `allowPublicSubnet` to `FunctionOptions`.

I also moved `filesystem` up to `FunctionOptions` while I was here.

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*By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license*

Author: adamdottv

packages/@aws-cdk/aws-lambda-python/package.json

@@ -67,12 +67,14 @@
   "dependencies": {
     "@aws-cdk/aws-lambda": "0.0.0",
     "@aws-cdk/core": "0.0.0",
+    "@aws-cdk/aws-ec2": "0.0.0",
     "constructs": "^3.0.4"
   },
   "homepage": "https://github.com/aws/aws-cdk",
   "peerDependencies": {
     "@aws-cdk/aws-lambda": "0.0.0",
     "@aws-cdk/core": "0.0.0",
+    "@aws-cdk/aws-ec2": "0.0.0",
     "constructs": "^3.0.4"
   },
   "engines": {