feat: Implement initial pulsar support

[jaysonsantos]

Description

This adds an initial support for pulsar

Type of change

• New feature (non-breaking change which adds functionality)
• This change requires a documentation update

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Provide instructions so we can reproduce. Please also list any relevant details for your test configuration

Initial integration tests were run with the following:

import threading

import pulsar
from pulsar import ConsumerType, InitialPosition


def main():
    client = pulsar.Client("pulsar://localhost:6650")
    print(client)
    producer = client.create_producer("sample")
    
    producer.send(b"hello world")

    consumer = client.subscribe("sample", "consumer-1", consumer_type=ConsumerType.KeyShared, initial_position=InitialPosition.Earliest)
    print(consumer.receive(1_000))

    done = threading.Event()

    def consume(consumer, message):
        print('Consumer', consumer, 'Message', message)
        done.set()
    consumer2 = client.subscribe("sample", "consumer-2", message_listener=consume, consumer_type=ConsumerType.KeyShared, initial_position=InitialPosition.Earliest)
    consumer2.resume_message_listener()

    done.wait()
    consumer2.close()
    consumer.close()

    producer.close()
    client.close()

Does This PR Require a Core Repo Change?

• Yes. - Link to PR:
• No.

Checklist:

See contributing.md for styleguide, changelog guidelines, and more.

• Followed the style guidelines of this project
• Changelogs have been updated
• Unit tests have been added
• Documentation has been updated

[ranimufid]

Suggested change

	SpanAttributes.MESSAGING_KAFKA_PARTITION, message.partition()
	SpanAttributes.MESSAGING_PULSAR_PARTITION, message.partition()

[ocelotl]

Thanks for the contribution! Please take a look at the comments.

[jaysonsantos]

I just realized that when I ran the linter locally, it got skipped 🤦

I will send the fixes soon and run those targets that failed

[jaysonsantos]

Done, I just rebased it with main

[ocelotl]

Some minor comments only

[jaysonsantos]

Hi @ocelotl i sent the fixes again, the broken tests seem unrelated to my changes, they break on http* libray

[jaysonsantos]

@ocelotl I notice a bug in send_sync and fixed and a few tests mocking the underlying c library that pulsar uses.

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