Change Requests to use a session, saving on latency for connect

[GavinMendelGleason]

This PR attempts to use request sessions to get around the connection latency which occurs on first connect.

[codecov]

Codecov Report

Merging #380 (8f7e88f) into main (eda31ca) will increase coverage by 1.11%.
The diff coverage is 92.00%.

@@            Coverage Diff             @@
##             main     #380      +/-   ##
==========================================
+ Coverage   70.54%   71.65%   +1.11%     
==========================================
  Files          11       43      +32     
  Lines        3812     4040     +228     
==========================================
+ Hits         2689     2895     +206     
- Misses       1123     1145      +22     

Impacted Files	Coverage Δ
terminusdb_client/woql_type.py	82.71% <ø> (ø)
terminusdb_client/client/Client.py	83.47% <91.11%> (+0.06%)	⬆️
terminusdb_client/schema/schema.py	78.55% <100.00%> (+0.18%)	⬆️
terminusdb_client/tests/woqljson/woqlReJson.py	100.00% <0.00%> (ø)
...nusdb_client/tests/integration_tests/mock_jsons.py	100.00% <0.00%> (ø)
terminusdb_client/tests/AllServerRecords.py	100.00% <0.00%> (ø)
terminusdb_client/tests/mockResponse.py	100.00% <0.00%> (ø)
terminusdb_client/tests/woqljson/woqlDeleteJson.py	100.00% <0.00%> (ø)
...minusdb_client/tests/integration_tests/conftest.py	86.95% <0.00%> (ø)
terminusdb_client/tests/woqljson/woqlIdgenJson.py	100.00% <0.00%> (ø)
... and 26 more

📣 We’re building smart automated test selection to slash your CI/CD build times. Learn more