Add tags and createdOn/completedOn timestamps to promises

[dfarr]

Closes #6
Closes #7

[codecov]

Codecov Report

Merging #9 (44ae889) into main (4f1f006) will increase coverage by 1.03%.
The diff coverage is 88.42%.

@@            Coverage Diff             @@
##             main       #9      +/-   ##
==========================================
+ Coverage   75.03%   76.06%   +1.03%     
==========================================
  Files          39       39              
  Lines        3264     3317      +53     
==========================================
+ Hits         2449     2523      +74     
+ Misses        666      647      -19     
+ Partials      149      147       -2     

Files Changed	Coverage Δ
internal/aio/aio.go	0.00% <0.00%> (ø)
internal/kernel/types/api_request.go	96.36% <ø> (ø)
pkg/promise/promise.go	94.59% <ø> (ø)
pkg/subscription/subscription.go	100.00% <ø> (ø)
internal/app/coroutines/readPromise.go	81.01% <64.28%> (+5.10%)	⬆️
internal/app/subsystems/aio/store/sqlite/sqlite.go	71.15% <73.33%> (+0.03%)	⬆️
internal/app/coroutines/timeoutPromise.go	88.23% <75.00%> (+0.14%)	⬆️
pkg/promise/record.go	67.27% <75.00%> (-2.73%)	⬇️
internal/app/coroutines/createPromise.go	83.75% <83.33%> (+3.10%)	⬆️
internal/app/coroutines/resolvePromise.go	86.26% <95.65%> (+2.56%)	⬆️
... and 14 more

... and 1 file with indirect coverage changes

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