hashi_vault - add alternate methods (env, ini, vars) for ca_cert option

[briantist]

SUMMARY

Fixes #75

Adds env:

• ANSIBLE_HASHI_VAULT_CA_CERT
• VAULT_CACERT (low-precedence, see hashi_vault - environment variable guidelines #10)

Adds vars:

• ansible_hashi_vault_ca_cert

Adds INI:

• ca_cert key in existing lookup_hashi_vault section.

ISSUE TYPE

• Feature Pull Request

COMPONENT NAME

hashi_vault

ADDITIONAL INFORMATION

[briantist]

cc @ArchLayperson

[codecov]

Codecov Report

Merging #97 (8f4c29b) into main (5a71552) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main      #97   +/-   ##
=======================================
  Coverage   82.97%   82.97%           
=======================================
  Files          16       16           
  Lines         787      787           
  Branches       78       78           
=======================================
  Hits          653      653           
  Misses        120      120           
  Partials       14       14           

Impacted Files	Coverage Δ
plugins/doc_fragments/connection.py	100.00% <ø> (ø)
plugins/module_utils/_hashi_vault_common.py	100.00% <ø> (ø)

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