I don't know of an addon that will do this automatically for you. Ultimately what you want is for the images in your page content to be inserted from the File Manager.

There is a bulk import in the file manager -- gather up all the image files, and use an FTP program to upload them all to SITEROOT/files/incoming/ directory, then in the File Manager, click "Upload Multiple" and then click the "Add Incoming" tab. Now that they're in the file manager, it will be a little easier (but still a manual process) -- when you're pasting in your content, where the image area supposed to go you click the "Insert Image" link in the blue bar at the top of the editing window, then find the image in the file manager, click on it, and click the "Choose" item.

If you have a *LOT* of content and photos, this is going to take a long time -- you might want to hire a temp to do this for you (if this is for a company site and you have any kind of budget).