Make ChangeStreamOptionsBuilder support startAtOperationTime

[tudormarc]

Make ChangeStreamOptionsBuilder support startAtOperationTime

Closes #3460

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[christophstrobl]

Thanks for the PR!

[christophstrobl]

After a closer look at the PR it seems the newly introduced methods/properties are never propagated to the driver. As @mp911de already mentioned, it is already possible to set startAtOperationTime via resumeAt. This is my bad, sorry - I should have taken a closer look upfront.
Nevertheless your PR helped us identify a glitch (#4167) in the existing reactive implementation which does apply the resume token for startAfter incorrectly to resumeAfter

[mp911de]

Superseded by #4167