hashi_vault - add env and vars for userpass options

[briantist]

SUMMARY

Fixes #54

Note: still no tests for userpass, see #67

Adds env:

• ANSIBLE_HASHI_VAULT_USERNAME
• ANSIBLE_HASHI_VAULT_PASSWORD

Add ansible vars:

• ansible_hashi_vault_username
• ansible_hashi_vault_password

ISSUE TYPE

• Feature Pull Request

COMPONENT NAME

hashi_vault

ADDITIONAL INFORMATION

[briantist]

cc @nwerker

[codecov]

Codecov Report

Merging #96 (baa637c) into main (5a71552) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main      #96   +/-   ##
=======================================
  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/lookup/hashi_vault.py	63.84% <ø> (ø)

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