refactor(source/wrappers): move wrappers logic away from execute file

[ivankatliarchuk]

What does it do ?

Moved source wrapper logic away from controller. I was trying to figure out if there is an easy way to chain handlers, seems like the logical step is to move specific logic to source/wrappers folder.

• moved build logic to source/wrappers
• added more tests cases

Motivation

Relates #5809

More

• Yes, this PR title follows Conventional Commits
• Yes, I added unit tests
• Yes, I updated end user documentation accordingly

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[ivankatliarchuk]

/retest

[coveralls]

Pull Request Test Coverage Report for Build 18246594909

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 4 unchanged lines in 2 files lost coverage.
• Overall coverage increased (+0.05%) to 78.605%

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Files with Coverage Reduction	New Missed Lines	%
apis/externaldns/types.go	1	99.71%
execute.go	3	61.28%

Totals
Change from base Build 18242454154:	0.05%
Covered Lines:	15846
Relevant Lines:	20159

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💛 - Coveralls