feat(proxy): proxy for aiohttp,base sessions (#284)

* feat(proxy): proxy for aiohttp,base sessions

Add support for proxies in aiohttp session with aiohttp_socks library,
edit BaseSession class to support proxies for other sessions in future.

* fix(annotation): missing underscore before "private" typevar

* chore: remove redundant of proxy_url schema for socks version

* test: add missing test

Add missing test, remove BaseSession.cfg and switch to
implementing class' "private" traits, add aiohttp_socks in dependency list as
optional and extra.

* feat(session):

Implement asyncio session for requests [wip]

* feat(proxy chain): Chained proxy support in aiohttp session

Add ChainProxyConnector support, !pin pydantic to "1.4", add
documentation on aiohttp connector.

* style(mypy): apply linter changes

* tests(mock): remove await for magic mock

* fix dangling dependency

* refactor(generic):

get rid of generic behaviour for base session

pyproject.toml

@@ -39,6 +39,7 @@ Babel = "^2.7"
 aiofiles = "^0.4.0"
 uvloop = {version = "^0.14.0", markers = "sys_platform == 'darwin' or sys_platform == 'linux'", optional = true}
 async_lru = "^1.0"
+aiohttp-socks = {version = "^0.3.8", optional = true}
 
 [tool.poetry.dev-dependencies]
 uvloop = {version = "^0.14.0", markers = "sys_platform == 'darwin' or sys_platform == 'linux'"}
@@ -63,9 +64,11 @@ pymdown-extensions = "^6.1"
 lxml = "^4.4"
 ipython = "^7.10"
 markdown-include = "^0.5.1"
+aiohttp-socks = "^0.3.4"
 
 [tool.poetry.extras]
 fast = ["uvloop"]
+proxy = ["aiohttp-socks"]
 
 [tool.black]
 line-length = 99