Can't compile to Python when package.json `description` contains new lines

[Chriscbr]

🐛 Bug Report

Affected Languages

• TypeScript or Javascript
• Python
• Java
• .NET (C#, F#, ...)
• Go

General Information

• JSII Version: unknown
• Platform: unknown

What is the problem?

Transferred from projen/projen#1333

Description:
Using description from the Node project and inserting new lines fails python compile.

Steps to reproduce:
INFO: Based on https://github.com/mmuller88/cdk-prowler

1. configure python compile e.g.

publishToPypi: {
    distName: 'cdk-prowler',
    module: 'cdk_prowler',
  },
...

2. Use description which contains a new line like:

const project = new awscdk.AwsCdkConstructLibrary({
  author: 'Martin Mueller',
  authorAddress: 'damadden88@googlemail.com',
  jsiiFqn: 'projen.AwsCdkConstructLibrary',
  cdkVersion,
  cdkVersionPinning: false,
  description: 'That is with \n newline' ,
...

3. yarn compile

Expected: Successful compile
Actual Restult:

👾 build » package | jsii-pacmak
[jsii-pacmak] [WARN] Failed building python
[jsii-pacmak] [WARN] python failed
Error: Command (/tmp/npm-pack2I9AVe/.env-XHf0Lg/bin/python setup.py sdist --dist-dir /home/martin/git/cdk-prowler/dist/python) failed with status 1:
#STDERR> Traceback (most recent call last):
#STDERR>   File "setup.py", line 4, in <module>
#STDERR>     kwargs = json.loads(
#STDERR>   File "/usr/lib/python3.8/json/__init__.py", line 357, in loads
#STDERR>     return _default_decoder.decode(s)
#STDERR>   File "/usr/lib/python3.8/json/decoder.py", line 337, in decode
#STDERR>     obj, end = self.raw_decode(s, idx=_w(s, 0).end())
#STDERR>   File "/usr/lib/python3.8/json/decoder.py", line 353, in raw_decode
#STDERR>     obj, end = self.scan_once(s, idx)
#STDERR> json.decoder.JSONDecodeError: Invalid control character at: line 5 column 34 (char 87)
#STDERR> 
#STDOUT> 
    at ChildProcess.<anonymous> (/home/martin/git/cdk-prowler/node_modules/jsii-pacmak/lib/util.js:119:27)
    at Object.onceWrapper (events.js:520:26)
    at ChildProcess.emit (events.js:400:28)
    at maybeClose (internal/child_process.js:1058:16)
    at Process.ChildProcess._handle.onexit (internal/child_process.js:293:5)

Workaround: Remove new lines :D

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