Add "subclass match" for session.get_instance()

[drew2a]

This PR changes the method Session.get_instance() in such a way that it returns not only instances with direct class match, but instances with subclass match.

This will allow crawlers to make changes to components and communities without making an actual change to the Tribler.

Example:

import asyncio
from pathlib import Path

from tribler.core.components.ipv8.ipv8_component import Ipv8Component
from tribler.core.components.key.key_component import KeyComponent
from tribler.core.components.metadata_store.metadata_store_component import MetadataStoreComponent
from tribler.core.components.tag.tag_component import TagComponent
from tribler.core.config.tribler_config import TriblerConfig
from tribler.core.utilities.tiny_tribler_service import TinyTriblerService


class CustomTagComponent(TagComponent):
    # Apply all necessary changes to the Tag Component here:
    ...


class Service(TinyTriblerService):
    def __init__(self, working_dir):
        super().__init__(TriblerConfig(state_dir=working_dir),
                         working_dir=working_dir,
                         components=[KeyComponent(), Ipv8Component(), MetadataStoreComponent(), CustomTagComponent()])


def run_tribler():
    service = Service(
        working_dir=Path(__file__).parent / 'tribler',
    )

    loop = asyncio.get_event_loop()
    loop.create_task(service.start_tribler())
    try:
        loop.run_forever()
    finally:
        loop.run_until_complete(loop.shutdown_asyncgens())
        loop.close()


if __name__ == "__main__":
    run_tribler()

[xoriole]

Nice PR!
Love it 👍