Add techjedi's image import script

[lstein]

What type of PR is this? (check all applicable)

• [X ] Feature

Have you discussed this change with the InvokeAI team?

• Yes

Have you updated all relevant documentation?

• Yes

Description

This PR adds the invokeai-import-images script, which imports a directory of 2.. -generated images into the current InvokeAI root directory, preserving and converting their metadata. The script also handles 3.* images.

Many thanks to @techjedi for writing this. This version differs from the original in two minor respects:

1. It is installed as an invokeai-import-images command.
2. The prompts for image and database paths use file completion provided by the prompt_toolkit library.

To Test

1. Activate the virtual environment for the destination root to import INTO
2. Run invokeai-import-images
3. Follow the prompts

Related Tickets & Documents

This is a frequently-requested feature on Discord, but I couldn't find an Issue.

QA Instructions, Screenshots, Recordings

Added/updated tests?

• Yes
• No : but should in the future

[lstein]

Note that this needs further work to make runnable in headless mode, but it is good to merge now given the demand for it.

[psychedelicious]

This is great, thank you!

Can you please attach your test images to this PR so those of us without old images can test?

I made one comment, but I'm not sure if any change is really needed.

(I also ran black on it)

[f412design]

Can you please attach your test images to this PR so those of us without old images can test?

All the metadata samples provided by lstein and others, as well as the ones I pulled from outdir and some of my own can be found at the link below:
https://1drv.ms/f/s!AtXsq10ysfY6lfYyxqHIh5_P6FJEBQ?e=4WVHVN

Versions included: 1.15, 2.0.2, 2.2.3, 2.2.4, 2.2.5, 2.3.0, 2.3.0_a0, 2.3.1, 2.3.5, 2.3.5_post2, 3.0.0_a0, 3.0.0_b1-5, 3.0.0_b6+, (also includes pre1.x files that only had a dream tag with prompt/seed.)

[ebr]

Import works really well!! Amazing job 👏

(apply suggestion to fix a typo, otherwise LGTM)