Create Test Fixture Library of Pre-compiled WASM Contracts #215

[Tijesunimi004]

Overview

This PR implements Issue #215 by creating a library of pre-compiled WASM test fixtures. This eliminates the need for dynamic compilation during tests, significantly reducing test overhead.

Changes

• Optimized Contracts: Implemented Counter, Echo, Always-panic, Budget-heavy, and Caller contracts in \ ests/fixtures/contracts/.
• Build Script: Added \ ests/fixtures/build_fixtures.sh\ to automate WASM compilation.
• Pre-compiled WASM: Added 5 pre-compiled .wasm\ files to \ ests/fixtures/wasm/.
• Integration: Updated \ ests/fixture_tests.rs\ with a new registration and invocation test using the pre-compiled fixtures.

Closes #215