Builder pattern in agency client configuration

[mirgee]

Allows constructing agency client more eloquently as

let agency_client = AgencyClient::new().configure(&agency_client_config)?;

Signed-off-by: Miroslav Kovar miroslav.kovar@absa.africa

[codecov-commenter]

Codecov Report

Merging #588 (3ec3ec6) into main (e60c74d) will not change coverage.
The diff coverage is 25.00%.

@@           Coverage Diff           @@
##             main     #588   +/-   ##
=======================================
  Coverage   59.77%   59.77%           
=======================================
  Files         139      139           
  Lines       15604    15604           
  Branches     3625     3625           
=======================================
  Hits         9328     9328           
  Misses       2405     2405           
  Partials     3871     3871           

Flag	Coverage Δ
integration-aries-vcx	52.47% <50.00%> (ø)
unittests-agency-client	25.45% <0.00%> (ø)
unittests-aries-vcx	52.55% <ø> (ø)

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

Impacted Files	Coverage Δ
agency_client/src/agency_client.rs	24.19% <0.00%> (ø)
aries_vcx/tests/test_agency.rs	55.67% <50.00%> (ø)

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