refactor: pluggable optional deps funcs centralized

[jkowalleck]

in preparation to a possible change or addition of optioanl dependencies.

see #1079

[codacy-production]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
✅ +0.10% (target: -1.00%)	✅ 99.46% (target: 90.00%)

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (f6acb83)	22920	22509	98.21%
Head commit (359b5b5)	23301 (+381)	22906 (+397)	98.30% (+0.10%)

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#1084)	368	366	99.46%

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

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