Add thread ID as default log entry property

[jkrmo]

Description

#109
Having the ThreadID as a default extended property on the log entry would be helpful and I don't think it would ever hurt anything.

I thought about where this addition could go - the log processor makes sense, but if a background processor is in place, the value won't be accurate. I also thought it could go on the Logger instance, but then custom implementations may not inherit this nicety.

Am curious on feedback or opinions on this type of addition.

Type of change:

3. New feature (non-breaking change that adds functionality)

Checklist:

• Have you reviewed your own code? Do you understand every change?
• Are you following the contributing guidelines?
• Have you added tests that prove your fix is effective or that this feature works?
• New and existing unit tests pass locally with these changes?
• Have you made corresponding changes to the documentation?
• Will this change require an update to an example project? (if so, create an issue and link to it)

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^{Reviewer guidelines}

[kristycurrier]

Let's open a discussion to talk about this, having a related issue is important.

[jkrmo]

Let's open a discussion to talk about this, having a related issue is important.

Sure - i've created #109 as a discussion point for this.