Add new rule: `Connection String in .NET Configuration` (#238) #1548

Job	Run time
CI (ubuntu-20.04.x86_64.stable.release)	2m 51s
CI (ubuntu-22.04.x86_64.stable.test)	1m 44s
CI (ubuntu-24.04.x86_64.stable.nodefaultfeatures)	1m 22s
CI (ubuntu-22.04.arm64.stable.release)	2m 58s
CI (ubuntu-24.04.arm64.stable.test)	1m 55s
CI (macos-13.x86_64.stable.test)	3m 5s
CI (macos-14.arm64.stable.test)	1m 15s
	15m 10s

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