Support timing test execution

[cptartur]

When running tests, measure the running time of each test and include that time in TestCaseSummary enum (for Passed and Failed test, can be for Skipped as well for easier printing).

After running snforge, total run time of whole test suite should be displayed similarly to cargo test: Tests: 9 passed, 2 failed, 0 skipped, finished in 1.23s. print_test_summary function will need to be updated to support that.

starknet-foundry/crates/forge/src/pretty_printing.rs

Line 27 in ceaf6c5

pub(crate) fn print_test_summary(summaries: &[TestFileSummary]) {

Time of all tests will need to be added and passed to that function call in here

starknet-foundry/crates/forge/src/lib.rs

Line 263 in ceaf6c5

pretty_printing::print_test_summary(&summaries);