task-api - Added rpc calls for managing apps

[maaktweluit]

Resolves #5097

Added new commands for:

golemcli debug rpc apps.list
golemcli debug rpc apps.update <app_id> <enabled_flag>
golemcli debug rpc apps.delete <app_id>

Other improvements are:

• Moved app definition json loading to AppManager ( @mfranciszkiewicz please double check )
• Added delete() to AppManager
• Added missing tearDown()s in tests that use TmpDirFixture

Creates new tasks:

• Add full argument to apps.list rpc call (https://github.com/golemfactory/golem/issues/5104)
• Add rpc commands to golemcli (Add rpc calls to apps.* golem-client#100)

[mfranciszkiewicz]

App definition loading seems to be on par with the previous version

[codecov]

Codecov Report

Merging #5103 into develop will decrease coverage by 0.19%.
The diff coverage is 87.34%.

@@            Coverage Diff             @@
##           develop    #5103     +/-   ##
==========================================
- Coverage    90.01%   89.82%   -0.2%     
==========================================
  Files          234      235      +1     
  Lines        22082    22132     +50     
==========================================
+ Hits         19877    19879      +2     
- Misses        2205     2253     +48

[etam]