feat: add NetworkMockResourceLoader fun interface

[MaxMichel2]

Summary

• Introduces NetworkMockResourceLoader fun interface in devview-networkmock-core, giving DI frameworks (Koin, Hilt, etc.) a named type to bind
• Switches devview-networkmock and devview-networkmock-ktor from implementation to api for devview-networkmock-core, so the type is transitively visible to all integrators
• Updates MockConfigRepository, NetworkMockInitializer, and NetworkMock to use the new type throughout; existing lambda call sites continue to work via SAM conversion

Motivation

In multi-module KMP projects, Compose Resources are module-scoped. When mock files live in a different module (e.g. data) than where NetworkMock is constructed (e.g. presentation), integrators previously had to define their own bridge interface, implementation, and DI binding — 3 files. With NetworkMockResourceLoader available as a named type, that collapses to a single DI binding:

// Before (3 files across domain + data modules)
// After (1 binding in the data module):
single<NetworkMockResourceLoader> { NetworkMockResourceLoader { Res.readBytes(it) } }

Test plan

• compileAndroidMain clean on -core and -networkmock
• Full test suite (testAndroidHostTest) passes — 284 tasks
• detektFull passes

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