cli: Add --skip-build flag to anchor test resolve #276

[ncnxx]

This PR adds another flag called --skip-build to the command anchor test to skip the building of Solana program in the workspace. This would save time when working on a large workspace where building would take time.

Previously, if the users would like to alter their tests and run anchor test again, the cli would build everything again. With, --skip-build, tests could be run right away without going through the building of source code again.

Example usage:

anchor test --skip-build

workspace % anchor test --skip-build


  someProgram
    ✓ Should initialize (59397ms)
    ✓ Should pass the test (4472ms)

[armaniferrante]

Awesome thanks for this!