KTOR-7298: Load modules dynamically only if development mode is enabled

[osipxd]

Subsystem
Server

Motivation
KTOR-7298 Android: "Array has more than one element" error when starting a server with release build

Solution
There were several problems with modules loading when code was optimized by R8 or ProGuard:

1. Extension Function<*>.methodName() could throw KotlinReflectionInternalError for obfuscated methods
2. clazz.declaredConstructors.single() in executeModuleFunction could throw IllegalArgumentException because the class could has either zero or more than one constructor (needs to be investigated further)
3. Dynamic loading of programmatic modules seems redundant for the case when development mode is disabled

Fixed all of these issues in separate commits so it's better to review commit-by-commit.