feat: add a generic install.sh installer

[moliholy]

This PR adds an install.sh script to install pop in any platform by using the latest release.

[codecov]

Codecov Report

❌ Patch coverage is 0% with 11 lines in your changes missing coverage. Please review.
✅ Project coverage is 77.34%. Comparing base (c4de048) to head (81f69a5).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
crates/pop-cli/src/commands/install/mod.rs	0.00%	11 Missing ⚠️

@@            Coverage Diff             @@
##             main     #670      +/-   ##
==========================================
- Coverage   77.36%   77.34%   -0.02%     
==========================================
  Files         109      109              
  Lines       25228    25234       +6     
  Branches    25228    25234       +6     
==========================================
  Hits        19518    19518              
- Misses       3728     3734       +6     
  Partials     1982     1982              

Files with missing lines	Coverage Δ
crates/pop-cli/src/commands/install/mod.rs	43.56% <0.00%> (-0.89%)	⬇️

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