feat(sdk): use transaction log to cap memory usage

[raubitsj]

Description

Use the transaction log (.wandb file) as a disk backed queue of work when network sending gets backed up.

Implemented:

• Move cancel logic to the writer thread.
• Convert stop_status and network_status polling to use mailbox
• Add new request wrappers for non-persistent versions of telemetry and summary records
• Add new finite state machine library to support describing state transitions with a datastructure
• And so much more... :)

TODO:

• add more to fsm tests (more state transitions and actions)
• add more to flowcontrol tests (telemetry update, etc)
• add more telemetry? maybe something adhoc for manual testing
• add telemetry for _sync and _offline

Future: ?

• Run parts of CI with lowered limits for memory buffer size
• Finish up relay merge into yea-wandb

Testing

How was this PR tested?

Checklist

• Include reference to internal ticket "Fixes WB-NNNN" and/or GitHub issue "Fixes #NNNN" (if applicable)
• Ensure PR title compliance with the conventional commits standards