chore(source): standardize sources with config

[ivankatliarchuk]

What does it do ?

Inline all sources. Example Gateway source

external-dns/source/gateway_tcproute.go

Line 31 in 98a2fa5

func NewGatewayTCPRouteSource(ctx context.Context, clients ClientGenerator, config *Config) (Source, error) {

Motivation

Should help to simplify support for sources

More

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

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[coveralls]

Pull Request Test Coverage Report for Build 20639523127

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 489 unchanged lines in 17 files lost coverage.
• Overall coverage decreased (-0.03%) to 78.772%

---

Files with Coverage Reduction	New Missed Lines	%
skipper_routegroup.go	3	39.34%
node.go	9	92.37%
pod.go	9	95.24%
istio_gateway.go	17	89.2%
f5_transportserver.go	17	76.92%
ingress.go	18	88.6%
crd.go	18	67.68%
f5_virtualserver.go	19	78.79%
openshift_route.go	20	84.06%
ambassador_host.go	21	82.43%

Totals
Change from base Build 20636734136:	-0.03%
Covered Lines:	15782
Relevant Lines:	20035

---

💛 - Coveralls