feat(wasm): complete PR of all wasm related changes to compile matrix-sdk-ffi bindings

[zzorba]

Here is a complete PR that contains all changes needed to compile the matrix-sdk-ffi bindings on a wasm PR. This is not intended to be reviewed/merged, but serve as a reference for the other smaller PRs with an e2e working example.

The first 5 commits on this branch correspond to separate PRs that have already been opened. The last mega-commit needs to be broken up further after those 5 commits have landed.

The remaining changes correspond to roughly:

• Relaxing Send conditionally on the async_trait annotations
• Removing components related to sqlite + files from the matrix-sdk-ffi crate conditionally.
• Avoiding the use of anyhow, which has Send requirements that are not met on a wasm platform.
• Removing wasm32 restrictions on some code (qrcode, many e2e features, timeline subscriptions), which are no longer needed due to improvements in upstream dependencies. Most of these seem to have been added defensively/reflexively.

With these bindings, it is possible to use https://github.com/jhugman/uniffi-bindgen-react-native to generate JS/TS bindings that are callable from normal JS code for all elements marked as uniffi.

• Public API changes documented in changelogs (optional)

Signed-off-by: Daniel Salinas

[zzorba]

From bindings/matrix-sdk-ffi, this can be compiled with the following command: cargo build --target wasm32-unknown-unknown --features js --no-default-features

[zzorba]

One thought looking at this, would I be better off exporting the 'useful' things from matrix-sdk-common from the matrix-sdk crate, instead of adding more deps onto matrix-sdk-common externally?

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.83%. Comparing base (34d3cd4) to head (fa7f596).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5127      +/-   ##
==========================================
- Coverage   85.87%   85.83%   -0.04%     
==========================================
  Files         338      339       +1     
  Lines       37070    37392     +322     
==========================================
+ Hits        31834    32096     +262     
- Misses       5236     5296      +60     

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