Merge Dev to main for release 0.4.0 (#74)

* Add logging dependency (#32)

* Changing yamato host flavor to large (#33)

* Amanda/read chunks (#36)

* s.send to s.sendall

* Increase default timeout

* Timeout as argument on instantiation

* Update version number (#38)

* Laurie/topic list (#41)

* Updating Contribution Content (#44)

* Contributing guidelines

* Issue templates

* PR feedback

* Updated per later changes (#45)

* Adding PR template (#46)

* One persistent connection for all messages sent to Unity

* make UnityService accessible from ros_tcp_endpoint (#49)

* Don't keep retrying on success (#50)

* Resolve conflicts for merging dev to main

* Queue module was renamed in Python 3 (#53)

* Update package.xml (#54)

* RosConnection 2.0 (#57)

* Remove outdated handshake references

* Fix sending response to unity service (#59)

* add changelog (#60)

* Forum links to README, config.yml (#61)

* Send empty message on connection start (#58)

* add test coverage for python scripts (#62)

* fix the bug (#64)

* Minor bug fixes (#65)

* Add Tests and Linter (#63)

* Add tests for tcp sender

* Add linter and pre-commit hooks

* Reformat with python black

* Add tests

* Add tests for server, client, publisher, subscriber, ros_service, unity_service, thread_pauser

* Fix pre-commit-config file name; Add client tests

* Add github workflow check

* Formatting

* Resolve conflicts (#66)

* Fix bug (#68)

* Fix bug

* Temporarily remove publisher test

Co-authored-by: Shuo Diao <shuo@unity3d.com>

* update version to 0.4.0 (#69)

Co-authored-by: Devin Miller (Unity) <mrpropellers@users.noreply.github.com>
Co-authored-by: Amanda <31416491+at669@users.noreply.github.com>
Co-authored-by: LaurieCheers-unity <73140792+LaurieCheers-unity@users.noreply.github.com>
Co-authored-by: Hamid Younesy <hyounesy@users.noreply.github.com>
Co-authored-by: peifeng-unity <56408141+peifeng-unity@users.noreply.github.com>