common crate for wasm shims

[insipx]

This PR adds a common crate & some utilities for testing WebAssembly

• creates common crate that houses:
  • the rand_xx fns that were duplicated across a couple crates
  • web assembly time:: shims, that are now accessible via xmtp_common::time. It should be a drop-in replacement for std::time, and preferable to use instead of std::time
  • xmtp_common::yield_ which delegates to tokio or the browsers executor depending on environment. Should be preferred over tokio::task::yield, since a WebAssembly future may not necessarily be running in a tokio executor
  • retry moved from xmtp_mls to common. Retry is general enough that this makes sense, and allows it to be used without including all of xmtp_mls.
  • traced_test moved from xmtp_mls to common. Also general enough to be used w/o mls, and useful elsewhere
  • xmtp_common includes a common logger initializer toggling on environment, xmtp_common::logger
• assert_x and optify macros moved to common
• new test utilities in store/mod.rs create triggers to track intent metadata (created/published/deleted) and exposed for tests on DbConnection

[insipx]

• common crate for wasm shims #1366 : 2 dependent PRs (#1376 , #1392 ) 👈 (View in Graphite)
• main

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