Feature: add ability to filter instruments and contracts

[GoldenChrysus]

get_conid by default returns the first contract of the first instrument it finds. This causes problems if multiple markets have instruments using this symbol, as a contract different from what was expected might be returned. I found this when looking up the $MUB US equity, which is not the first $MUB instrument returned by IB, so I didn't receive the contract ID I wanted.

Two parameters, instrument_filters and contract_filters, are added to get_conid. instrument_filters filters the instrument data, i.e. the name, chineseName, and assetClass fields. contract_filters filters the contract data, i.e the exchange and isUS fields. All filters must be fulfilled for the instrument/contract to be included. The filters can be used together.

I've added some samples of searching for US $MUB using the filters.

[sourcery-ai]

Sourcery Code Quality Report

❌  Merging this PR will decrease code quality in the affected files by 6.76%.

Quality metrics	Before	After	Change
Complexity	0.62 ⭐	2.83 ⭐	2.21 👎
Method Length	39.50 ⭐	44.86 ⭐	5.36 👎
Working memory	6.16 ⭐	4.99 ⭐	-1.17 👍
Quality	85.66% ⭐	78.90% ⭐	-6.76% 👎

Other metrics	Before	After	Change
Lines	277	302	25

Changed files	Quality Before	Quality After	Quality Change
src/easyib/easyib.py	85.66% ⭐	78.90% ⭐	-6.76% 👎

Here are some functions in these files that still need a tune-up:

File	Function	Complexity	Length	Working Memory	Quality	Recommendation
src/easyib/easyib.py	REST.get_conid	12 🙂	165 😞		50.25% 🙂	Try splitting into smaller methods
src/easyib/easyib.py	REST.get_bars	2 ⭐	70 🙂	11 😞	69.46% 🙂	Extract out complex expressions
src/easyib/easyib.py	REST.modify_order	1 ⭐	62 🙂	10 😞	73.59% 🙂	Extract out complex expressions

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[utilmon]

Thanks for the improvement!