Yes, and sort of
The description of the time stop spell says:
during which you can use actions
It says actions, multiple. A bonus action is an additional action:
Various class features, spells and other abilities let you take an additional action on your turn called a bonus action.
So the bonus action is an action and combined with your normal action make multiple actions.
Now, a reaction is a weird one for Time Stop.
Certain special abilities, spells, and situations allow you to take a special action called a reaction. A reaction is an instant response to a trigger of some kind, which can occur on your turn or on someone else’s. The opportunity attack is the most common type of reaction.
When you take a reaction, you can’t take another one until the start of your next turn. If the reaction interrupts another creature’s turn, that creature can continue its turn right after the reaction.
It says it is a special action, so that is also an action which is allowed under time stop. However...
Since time is standing still, no (external) triggers occur and you will have to wait for time stop to end to trigger/execute your reaction.
For the commenters below, yes you could have a trigger like that.
In my experience reactions are usually something like, "if he unsheathes his sword I release the Lightning Bolt" or "when he turns his back I pickpocket the key of his belt".
That's why I said taking the reaction is a bit weird when time stops, I don't think it is impossible.