add samples for BigDecimal expectation functions in api-infix

[robstoll]

Platform (all, jvm, js): all
Extension (none, kotlin 1.3): none

Code related feature

We already have samples in ch.tutteli.atrium.api.fluent.en_GB.samples.BigDecimalExpectationSamples but only cover expect toEqual ... in api-infix. We want to cover the rest of the functions as well.

TODO:

• make sure every function in apis/infix/atrium-api-infix/src/jvmMain/kotlin/ch/tutteli/atrium/api/infix/en_GB/bigDecimalExpectations.kt which is not deprecated has a corresponding sample in ch.tutteli.atrium.api.infix.en_GB.samples.BigDecimalExpectationSamples and links to it => see toEqual in bigDecimalExpectations.kt for an already implemented case (and take a look at ch.tutteli.atrium.api.fluent.en_GB.samples.BigDecimalExpectationSamples as guidance for the samples, make sure you use the infix api though.)

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[VarunEnishetty]

Hi @robstoll , I would like to work on this issue.
Can you please assign this task to me and also help me with any changes to considered?

[robstoll]

@VarunEnishetty the description should still fit, let me know if you have questions

[VarunEnishetty]

@robstoll , can you please look into this PR - #1513