New API: Metadata::new_from_app1_segment

[hfiguiere]

Draft as it requires https://github.com/felixc/gexiv2-sys/pull/21

Tested it locally.

Use case with https://github.com/maxicarlos08/gphoto2-rs/pull/53

[hfiguiere]

Requirements have been released.

[felixc]

I updated Cargo.toml to use the latest version of glib-sys to match gexiv2-sys, which fixed a build failure that only appeared if you build with the raw-tag-access feature.

I've also reconfigured CircleCI to run builds for pull requests and not just the main branch.

[felixc]

Right; will need to bump MSRV here too.

[codecov[bot]]

Codecov Report

Base: 68.96% // Head: 69.13% // Increases project coverage by +0.16% :tada:

Coverage data is based on head (e765ebe) compared to base (41774f4). Patch coverage: 77.77% of modified lines in pull request are covered.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #62 +/- ## ========================================== + Coverage 68.96% 69.13% +0.16% ========================================== Files 1 1 Lines 928 946 +18 ========================================== + Hits 640 654 +14 - Misses 288 292 +4 ``` | [Impacted Files](https://codecov.io/gh/felixc/rexiv2/pull/62?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Felix+Crux) | Coverage Δ | | |---|---|---| | [src/lib.rs](https://codecov.io/gh/felixc/rexiv2/pull/62?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Felix+Crux#diff-c3JjL2xpYi5ycw==) | `69.13% <77.77%> (+0.16%)` | :arrow_up: | Help us with your feedback. Take ten seconds to tell us [how you rate us](https://about.codecov.io/nps?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Felix+Crux). Have a feature suggestion? [Share it here.](https://app.codecov.io/gh/feedback/?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Felix+Crux)

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[hfiguiere]

Here is a sample:

exif_IMG_6036.JPG.bin.gz

[hfiguiere]

I added a test for it now.

[felixc]

Thank you very much!

I hope it's OK with you that I added you to the contributors list in CONTRIBUTORS.md

I appreciate the test, too. It's something I didn't add enough to the codebase early on, so now I'm trying to bring up the coverage on new code at least to make it safer to make changes in the future. I did end up changing it to use a smaller buffer to minimize the size of the repo diffs/downloads, though.

Thanks again for the contribution -- I'll push out a new version including this soon!