Add new_context() option to copy a context

[jborean93]

Adds the new_context() function that will create a new context based on the existing contexts credentials and options. This is designed to be a more efficient way to recreate a brand new security context. For example it can recreate the context with a cached provider specific credential rather than retrieving a new one for each context. This is important when using Kerberos authentication as the retrieved TGT can be cached and reused across multiple contexts.

[codecov[bot]]

Codecov Report

Merging #58 (0fafcf4) into main (5644e1a) will decrease coverage by 0.77%. The diff coverage is 89.23%.

:exclamation: Current head 0fafcf4 differs from pull request most recent head 603d91e. Consider uploading reports for the commit 603d91e to get more accurate results

@@            Coverage Diff             @@
##             main      #58      +/-   ##
==========================================
- Coverage   99.94%   99.17%   -0.78%     
==========================================
  Files          31       31              
  Lines        5274     5303      +29     
==========================================
- Hits         5271     5259      -12     
- Misses          3       44      +41     

Flag	Coverage Δ
	99.17% <89.23%> (-0.78%)	:arrow_down:
py3.10	99.17% <89.23%> (-0.78%)	:arrow_down:
py3.11	99.17% <89.23%> (-0.78%)	:arrow_down:
py3.7	99.16% <89.23%> (-0.78%)	:arrow_down:
py3.8	99.16% <89.23%> (-0.78%)	:arrow_down:
py3.9	99.16% <89.23%> (-0.78%)	:arrow_down:
x64	99.17% <89.23%> (-0.78%)	:arrow_down:
x86	94.43% <75.38%> (-0.79%)	:arrow_down:

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/spnego/_credssp.py	99.67% <50.00%> (-0.33%)	:arrow_down:
src/spnego/_ntlm.py	97.02% <55.55%> (-2.98%)	:arrow_down:
src/spnego/_sspi.py	92.60% <90.00%> (-7.40%)	:arrow_down:
src/spnego/_negotiate.py	95.27% <96.66%> (-4.73%)	:arrow_down:
src/spnego/_context.py	100.00% <100.00%> (ø)
src/spnego/_gss.py	99.05% <100.00%> (-0.63%)	:arrow_down:

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