refactor(linter): decouple module resolution from import plugin

[DonIsaac]

The linter's Runtime currently checks if import plugin is enabled before resolving imported modules. We want this feature to be controlled via its own new setting. This will let us change if/when/why module resolution happens in the future.

Examples

Here are some, but not all, of the parts of Runtime that need refactoring:

oxc/crates/oxc_linter/src/service.rs

Line 168 in 7799c06

let resolver = linter.options().plugins.has_import().then(|| {

oxc/crates/oxc_linter/src/service.rs

Line 313 in 7799c06

if self.linter.options().plugins.has_import() {

Tasks

• Add a new cross_module flag to LintServiceOptions and have Runtime consume it.
• Remove all usages of plugins.has_import() from Runtime

Acceptance Criteria

• cross_module should default to false unless import plugin is enabled.
• Runtime and LintService's APIs should not change.
• No references to plugin.has_import() remain in Runtime.