SMTChecker: Add command-line test for invariants from Eldarica

test/cmdlineTests/model_checker_invariants_contract_eld/args

@@ -0,0 +1 @@
+--model-checker-engine chc --model-checker-invariants contract --model-checker-solvers eld

test/cmdlineTests/model_checker_invariants_contract_eld/err

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+Info: CHC: 1 verification condition(s) proved safe! Enable the model checker option "show proved safe" to see all of them.
+
+Info: Contract invariant(s) for model_checker_invariants_contract_eld/input.sol:test:
+(x = 0)

test/cmdlineTests/model_checker_invariants_contract_eld/input.sol

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+// SPDX-License-Identifier: GPL-3.0
+pragma solidity >=0.0;
+contract test {
+	uint x;
+	function f() public view {
+		assert(x < 10);
+	}
+}