## Description, Motivation and Context

Due to various layers of proxying, sometimes a proxied request ends up
with multiple leading slashes. Some web servers do not not normalise
request paths, leading to 404's.

This PR normalises the received request path on the mock server before
matching against contract paths, and normalises the received request
paths when proxying the request.

## Checklist:

- [x] I've added/updated tests to cover my changes
- [x] I've created an issue associated with this PR

…2069)

## Description, Motivation and Context

This PR fixes a bug in the proxy hostname parsing, where we currently
accidentally use the wrong field from the parsed `URL` object to refer
to the hostname of the proxy.
https://developer.mozilla.org/en-US/docs/Web/API/URL — the `host`
attribute is of the form `<host>:<port>` if present, whereas `hostname`
is just `<host>`. How we use the parsed attribute expects just a
hostname without a port number.

This PR fixes this bug by using the `hostname` attribute of the parsed
URL instead of the `host` attribute. While I was here, I also added
tests for this proxy URL parsing function given there were none before.

## Checklist:

- [x] I've added/updated tests to cover my changes
- [x] I've created an issue associated with this PR

## Description, Motivation and Context

This PR introduces a new option, `--proxyMockBaseUrl`, which can be used
to proxy requests for draft contracts to a HTTP server instead of
returning mocked response. With this, we now have the functionality to
have a local implementation of a particular new draft contract while
using existing live implementations for all other contracts and
non-contract requests. For example, what I've been using this for
locally is:

```
spot mock \
    --port 5601 \
    --proxyBaseUrl https://api.dev.company.com \
    --proxyFallbackBaseUrl https://api.dev.company.com \
    --proxyMockBaseUrl http://127.0.0.1:3000 \  # Hit a locally running server for draft requests
    ~/some/path/to/spots/api.ts
```

The diff of this PR is best viewed with whitespace ignored, as there's a
large block of indentation changes:
https://github.com/airtasker/spot/pull/2070/files?diff=split&w=1

## Checklist:

- [x] I've added/updated tests to cover my changes
- [x] I've created an issue associated with this PR

Run CI across multiple NodeJS versions to help ensure we make forwards
and backwards compatible changes.

Updates dependencies to make spot work with later TS versions and
monorepos (yarn workspaces)