Restore and send gaps for Windows events

[duhminick]

Description of the issue

Similar to https://github.com/aws/amazon-cloudwatch-agent/pull/1721 but instead for Windows. With multi-threaded support, it is possible that certain events were not sent: gaps in event delivery. We want to send those events on agent startup.

We also did not have any mocking for the sys calls to the Windows event API. This results in events being written to Windows directly since the actual sys calls were used for the tests.

Description of changes

How does this change address the problem?

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Tests

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Requirements

Before commiting your code, please do the following steps.

1. Run make fmt and make fmt-sh
2. Run make lint

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