feat/add_injective_v2_paper_trade_support

[aarmoa]

Before submitting this PR, please make sure:

• Your code builds clean without any errors or warnings
• You are using approved title ("feat/", "fix/", "docs/", "refactor/")

A description of the changes proposed in the pull request:
This PR adds Injective V2 spot connector to the list of paper trade connectors.
Includes a refactoring to make the client configuration for paper trade connectors the only official list of paper trade connectors.

Tests performed by the developer:
All unit tests passing in green

Tips for QA testing:

• Run a pure market making strategy using the injective_v2_paper_trade connector.
• Check that you can create an Avellaneda strategy.
• Check that you can create a Cross Exchange Market Making strategy.

PRP: https://snapshot.org/#/hbot-prp.eth/proposal/0xd74ce4c37dbc73a9379956c6f535117569cc95d09ff183cf52868b9ab1a568e9

[cardosofede]

LGTM!

[cardosofede]

@aarmoa @rapcmia the poll already met the quorum, but I think that based on the nature of the PR we can merge it without the final approval time. What do you think @fengtality ?

[nikspz]

@aarmoa Could you please review this issue?
it happened on the start of the strategy using injective_v2_paper_trade

Steps:
Start the client
Create pureMM strategy using injective_v2_paper_trade
start the strategy

Actual:
Review Unhandled error in background task showing

logs_injpaper2.log
6684.zip

2023-11-29 14:51:47,595 - 2763684 - hummingbot.core.utils.async_utils - ERROR - Unhandled error in background task: 
Traceback (most recent call last):
  File "/home/nikita/injpaper6684/hummingbot/core/utils/async_utils.py", line 9, in safe_wrapper
    return await c
  File "/home/nikita/injpaper6684/hummingbot/connector/exchange/injective_v2/injective_v2_api_order_book_data_source.py", line 40, in listen_for_subscriptions
    await self._data_source.start(market_ids=market_ids)
  File "/home/nikita/injpaper6684/hummingbot/connector/exchange/injective_v2/data_sources/injective_data_source.py", line 222, in start
    await self.initialize_trading_account()
  File "/home/nikita/injpaper6684/hummingbot/connector/exchange/injective_v2/data_sources/injective_read_only_data_source.py", line 211, in initialize_trading_account
    raise NotImplementedError
NotImplementedError

[aarmoa]

Sorry @nikspz, I did not receive a notification with your comment. I will take a look at the issue.

[aarmoa]

@nikspz please try again. I made some changes for paper trade to work also when there is no Injective V2 connector configured in the system

[nikspz]

Test performed:

• Cloned and installed feature branch
• Manually built docker image successfully
• Created/started pureMM using injective_v2_paperTrade successfully
• Created/started pureMM using binance successfully
• Created/started XEMM strategy using injective_v2_paperTrade and binance_paperTrade successfully
• Created/started avellaneda_market_making strategy using injective_v2_paperTrade