fix/trade fill CSV export columns

[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:
PR created to solve the issue #5057
Change in the markets recorder to use a fixed list of fields from the TradeFill object to include in the export file, instead of determining it dynamically based on the content of each trade fill.

Tests performed by the developer:
Added unit tests to check the list of fields to export is the expected one, and that the fields' content can be accessed without problems.
Manually tested by running a PMM strategy connected with Binance.

Tests performed:

• Setup pure market making bots running long term and confirmed only one CSV file for each running bot is created for trades that are executed
• Also did the same test locally on paper trade exchanges with the same result
• Checked the CSV file and confirmed that it matches with the trades executed on the client and exchange
• Tried to reproduce the issue using the steps provided on the issue ticket and wasn't able to replicate during testing

Tips for QA testing:
The scenario can be reproduced following the description of the original issue.

This PR comes from CoinAlpha#68

Fixes #5057

[dennisocana]

Proposal created: https://snapshot.org/#/hbot-prp.eth/proposal/0x5ae5d349f8798f65d0fc2537782e3d048c0462c51b12e614a1d261caff95c2bf

[rapcmia]

PR update: on-going test

[rapcmia]

Tested and confirmed working by QA
Test performed:

• Setup long term testbots running on pure market making and only one CSV created for trades
• Setup local testbot and ran test each trade event (disconnecting to network, changing market and forced close bot), only one CSV created
• Tested also on other strategies, all ok
• Trades from the bot and CSV file matched