chore(tests): add toxiproxy for integration testing network issues

[iainsproat]

• removes unnecessary speckle-server components not required for integration tests
• speckle-server is addressable on port 3001, proxied via toxiproxy

Refer to https://github.com/specklesystems/speckle-sharp-sdk/pull/39 for more details.

Description & motivation

Changes:

To-do before merge:

Screenshots:

Validation of changes:

Checklist:

• [ ] My pull request follows the guidelines in the Contributing guide?
• [ ] My pull request does not duplicate any other open Pull Requests for the same update/change?
• [ ] My commits are related to the pull request and do not amend unrelated code or documentation.
• [ ] My code follows a similar style to existing code.
• [ ] I have added appropriate tests.
• [ ] I have updated or added relevant documentation.

References

[JR-Morgan]

Closing, we'll bring this in v3, not v2