cancel all long-running tasks

[jackstar12]

Not all long-running tasks are cancelled upon shutdown, which caused some issues with WALLET.cleanup.

I introduced a few new functions:

• create_task basically a wrapper around the asyncio equivalent, adds the task to a list
• cancel_all_tasks cancels all tasks previously created with create_task (if any are already stopped, cancel will do nothing)
• create_permanent_task wrapper around create_task with catch_everything_and_restart

Now all tasks are cancelled on shutdown and WALLET.cleanup goes without errors.

[codecov-commenter]

Codecov Report

Merging #1793 (6ea995c) into main (03acf5e) will decrease coverage by 1.02%.
The diff coverage is 34.48%.

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@@            Coverage Diff             @@
##             main    #1793      +/-   ##
==========================================
- Coverage   56.09%   55.08%   -1.02%     
==========================================
  Files          48       48              
  Lines        7328     7329       +1     
==========================================
- Hits         4111     4037      -74     
- Misses       3217     3292      +75     

Files Changed	Coverage Δ
lnbits/app.py	43.79% <11.11%> (-0.05%)	⬇️
lnbits/tasks.py	33.00% <35.71%> (-0.33%)	⬇️
lnbits/core/tasks.py	24.39% <66.66%> (-1.70%)	⬇️

... and 1 file with indirect coverage changes

📣 We’re building smart automated test selection to slash your CI/CD build times. Learn more

[dni]

LGTM

[jackstar12]

another interesting side effect of this is that extensions are loaded inside tests aswell, but I dont think this should be considered an issue

[motorina0]

another interesting side effect of this is that extensions are loaded inside tests aswell, but I dont think this should be considered an issue

• only extensions listed in LNBITS_EXTENSIONS_DEFAULT_INSTALL should be installed by default
• if this value is empty no extension will be installed

[motorina0]

LGTM

great job @jackstar12 !

[dni]

another interesting side effect of this is that extensions are loaded inside tests aswell, but I dont think this should be considered an issue

* only extensions listed in `LNBITS_EXTENSIONS_DEFAULT_INSTALL` should be installed by default

* if this value is empty no extension will be installed

good catch, dont install default exts for test when run locally! :)
#1861