feat: Add swift wasm CI targets to DataLoader

[scottmarchant]

Change summary

Added swift wasm as a CI target, to help prevent future breakages to swift wasm builds in DataLoader

Details

• Added ci stage that checks wasm compilation.
• Temporarily pointing to a branch of swift-nio to verify wasm compilation, as swift-nio/NIOCore is currently broken. The swift-nio version will be bumped before merging this.
• Bump swift version from 5.8 to 5.10.0, which is the new minimum for the latest swift-nio dependency.
• Add wasi 0.1 build status badge to README.md.

Notes

• Because the build status badge uses an unmerged workflow (.github/workflows/wasm.yaml), it can't be tested until this PR is merged. Some follow-on work may be needed after merging to ensure proper badge functionality.
• This PR is part of a larger effort by PassiveLogic to add wasm support to many popular repositories.

PR Dependencies

The following PR's must be merged before this PR can be merged:

• ci: Remove swift 5.8 and 5.9 builds from test matrix. Add Swift 6.1. ci#3
• fix: Fix compiler error found on latest main that breaks wasip1 (wasm) compilation apple/swift-nio#3271

Testing done

Verified new github workflow builds, once required upstream dependencies are patched in swift-nio

See https://github.com/PassiveLogic/DataLoader/actions/runs/15833601501/job/44631947127?pr=1

Remaining work

• Update this PR after swift-nio wasm build is merged and released
• After merging, verify badge works as expected. As noted, this can't be tested until after merging. Submit patch for new badge if needed.

[scottmarchant]

Note, this might be a breaking change for some users of this repository, depending on what swift version they are using. It shouldn't be very hard for anyone to move from Swift 5.8 to Swift 5.10, though.

[scottmarchant]

The error for swift 5.8 should pass now that the ci change is merged.

error: 'dataloader': package 'dataloader' is using Swift tools version 5.10.0 but the installed version is 5.8.1