refact: list subscriptions & export & add subscription

[codecov-commenter]

Codecov Report

Merging #194 (5c0660f) into master (7d7de2d) will increase coverage by 0.06%. The diff coverage is 36.36%.

@@            Coverage Diff             @@
##           master     #194      +/-   ##
==========================================
+ Coverage   28.47%   28.54%   +0.06%     
==========================================
  Files          12       12              
  Lines         467      466       -1     
==========================================
  Hits          133      133              
+ Misses        309      308       -1     
  Partials       25       25              

Flag	Coverage Δ
unittests	28.54% <36.36%> (+0.06%)	:arrow_up:

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
internal/bot/bot.go	3.07% <0.00%> (-0.05%)	:arrow_down:
internal/storage/user.go	53.84% <ø> (+3.84%)	:arrow_up:
internal/storage/subscription.go	68.75% <66.66%> (-0.75%)	:arrow_down:

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