Message section of the Gmail tool

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What does this PR do?

Fixes #473

Summarise the main tasks handled in the pull request Added the Message section of Gmail

Description of Task to be completed?

Describe (in detail) what the task completed in the pull request does as per the relevant task

How should this be manually tested?

Give bullet point instructions on how to setup the code and test it manually (Assume no prior experience on JS or code)

Any background context you want to provide?

Any pertinent information that should be considered

What is the link to the issue on Github?

Issue #473

Questions:

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zurichat / zc_plugin_tools