fix: Allow --aot-cache and --debug-intermediate-files flags to be specified with equals

[harmony7]

The CLI parses command line flags by iterating each token.

Flags that take values (e.g., --engine-wasm) can be processed with or without an equals sign after the flag name

e.g., the following are equivalent:

js-compute-runtime --engine-wasm=foo.wasm input.js output.wasm
js-compute-runtime --engine-wasm foo.wasm input.js output.wasm

The logic to check for the "equals" version was missing from --aot-cache and --debug-intermediate-files.
This PR adds those.

Additionally, the error message when --debug-intermediate-files was missing a value was mislabeled. This PR fixes that.