add upsert function for updating beacon events

[kerryarchibald]

• Adds a function to allow updating beacon_info events using suffixed m.beacon_info.* event types.
• expose event type on beacon model
• allow setting timestamp on beacon info content helper

[codecov-commenter]

Codecov Report

Merging #2247 (b713f60) into develop (905a884) will increase coverage by 0.06%.
The diff coverage is 84.61%.

@@             Coverage Diff             @@
##           develop    #2247      +/-   ##
===========================================
+ Coverage    58.05%   58.12%   +0.06%     
===========================================
  Files           92       92              
  Lines        16381    16389       +8     
  Branches      3772     3773       +1     
===========================================
+ Hits          9510     9526      +16     
+ Misses        6871     6863       -8     

Impacted Files	Coverage Δ
src/models/beacon.ts	93.33% <75.00%> (-4.23%)	⬇️
src/client.ts	35.44% <100.00%> (+0.49%)	⬆️
src/content-helpers.ts	78.26% <100.00%> (+0.48%)	⬆️