web: add an HTTP interface for executing login and logout operations

[nikolaas]

No description provided.

[codecov-io]

Codecov Report

Merging #2 into master will increase coverage by 1.86%.
The diff coverage is 73.59%.

@@            Coverage Diff             @@
##           master       #2      +/-   ##
==========================================
+ Coverage    70.7%   72.57%   +1.86%     
==========================================
  Files           3        5       +2     
  Lines         198      299     +101     
==========================================
+ Hits          140      217      +77     
- Misses         32       51      +19     
- Partials       26       31       +5

Impacted Files	Coverage Δ
internal/oidc/logout.go	70.58% <100%> (ø)	⬆️
internal/web/web.go	70.73% <70.73%> (ø)
internal/stat/stat.go	73.33% <73.33%> (ø)
internal/oidc/login.go	74.82% <90%> (+3.39%)	⬆️

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