Add support for source maps

[RReverser]

Use the new getCallSites API, which is both a bit simpler to use than V8 one, but also integrates correctly with Node.js source maps support.

For a demo, I renamed example.js to example.ts) and used tsx to run it.

Before:

> npx tsx --enable-source-maps example.ts
There are 4 handle(s) keeping the process running.

# Timeout
example.ts:1 - import whyIsNodeRunning from 'why-is-node-running' // should be your first import
example.ts:1 - import whyIsNodeRunning from 'why-is-node-running' // should be your first import

# TCPSERVERWRAP
example.ts:1 - import whyIsNodeRunning from 'why-is-node-running' // should be your first import
example.ts:1 - import whyIsNodeRunning from 'why-is-node-running' // should be your first import

# Timeout
example.ts:1 - import whyIsNodeRunning from 'why-is-node-running' // should be your first import
example.ts:1 - import whyIsNodeRunning from 'why-is-node-running' // should be your first import

# TCPSERVERWRAP
example.ts:1 - import whyIsNodeRunning from 'why-is-node-running' // should be your first import
example.ts:1 - import whyIsNodeRunning from 'why-is-node-running' // should be your first import

After:

> npx tsx --enable-source-maps example.ts
There are 4 handle(s) keeping the process running.

# Timeout
example.ts:6  - setInterval(() => {}, 1000)
example.ts:10 - startServer()

# TCPSERVERWRAP
example.ts:7  - server.listen(0)
example.ts:10 - startServer()

# Timeout
example.ts:6  - setInterval(() => {}, 1000)
example.ts:11 - startServer()

# TCPSERVERWRAP
example.ts:7  - server.listen(0)
example.ts:11 - startServer()