added confirmation dialog when installing plugins

[jdx]

Fixes #790

[codecov]

Codecov Report

Patch coverage: 90.13% and project coverage change: -2.15% ⚠️

Comparison is base (3986e9f) 87.63% compared to head (440d6e3) 85.49%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #812      +/-   ##
==========================================
- Coverage   87.63%   85.49%   -2.15%     
==========================================
  Files         130      131       +1     
  Lines       11416    11462      +46     
==========================================
- Hits        10004     9799     -205     
- Misses       1412     1663     +251     

Files Changed	Coverage Δ
src/config/config_file/rtx_toml.rs	82.75% <0.00%> (-0.12%)	⬇️
src/cli/mod.rs	91.04% <75.00%> (-1.27%)	⬇️
src/config/settings.rs	92.45% <83.33%> (-0.27%)	⬇️
src/plugins/external_plugin.rs	86.18% <84.84%> (-0.34%)	⬇️
src/plugins/mod.rs	72.56% <93.10%> (+10.21%)	⬆️
src/cli/args/yes.rs	100.00% <100.00%> (ø)
src/cli/install.rs	87.85% <100.00%> (+1.61%)	⬆️
src/cli/ls_remote.rs	97.05% <100.00%> (-0.95%)	⬇️
src/cli/plugins/install.rs	91.95% <100.00%> (-0.76%)	⬇️
src/cli/settings/unset.rs	96.96% <100.00%> (+0.09%)	⬆️
... and 3 more

... and 6 files with indirect coverage changes

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