Feature request: `samplesheetToMaps` function

Sometimes, it would be useful to parse a samplesheet and return a key-val pair instead of a list of tuples as is returned by samplesheetToList. We could add a samplesheetToMaps function which returns a list of key-val pairs.

name,language,greeting
adam,english,hello
geraldine,french,bonjour

samplesheetToList('greetings.csv')
[
    [ 'adam', 'english', 'hello' ],
    [ 'geraldine', 'french', 'bonjour' ]
]

samplesheetToMap('greetings.csv')
[
    [ name: 'adam', language: 'english', greeting: 'hello' ],
    [ name: 'geraldine', language: 'french', greeting: 'bonjour']
]

Start by locating the existing samplesheetToList function and reading how it parses the CSV examples shown in the issue. Add the requested map-returning counterpart, resolve the samplesheetToMap versus samplesheetToMaps naming, and verify that each row uses the header names as keys.