[Feature] Support --network selection in CLI.

[d0cd]

This PR allows users to select the network via the --network flag in the Leo CLI.

[codecov]

Codecov Report

Attention: Patch coverage is 43.72760% with 157 lines in your changes are missing coverage. Please review.

Project coverage is 74.65%. Comparing base (920dff9) to head (c485ee5).

Files	Patch %	Lines
leo/cli/commands/account.rs	29.57%	50 Missing ⚠️
leo/cli/commands/execute.rs	0.00%	43 Missing ⚠️
errors/src/errors/cli/cli_errors.rs	0.00%	16 Missing ⚠️
leo/cli/commands/run.rs	50.00%	12 Missing ⚠️
leo/cli/commands/example.rs	0.00%	8 Missing ⚠️
leo/cli/commands/build.rs	81.25%	6 Missing ⚠️
leo/package/src/package.rs	84.37%	5 Missing ⚠️
leo/cli/commands/deploy.rs	0.00%	3 Missing ⚠️
utils/retriever/src/program_context/manifest.rs	75.00%	3 Missing ⚠️
leo/cli/commands/query/utils.rs	0.00%	2 Missing ⚠️
... and 7 more

Additional details and impacted files

@@             Coverage Diff             @@
##           mainnet   #27967      +/-   ##
===========================================
- Coverage    75.15%   74.65%   -0.50%     
===========================================
  Files          217      218       +1     
  Lines         7477     7544      +67     
  Branches      7477     7544      +67     
===========================================
+ Hits          5619     5632      +13     
- Misses        1858     1912      +54     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.