Implemented parsing and generation of corrected assertions in docmap.
Tests and fixtures were updated to verify this new feature. An
additional correctedDate field was added to preprints and reviewed
preprints. A new corrected status was also added to AssertionStatus.

Improve readability by splitting imports from 'docmap-generators' into separate lines.

…preprints-issues#1120]

Update the correction structure in the docmap-parser and its test cases. Now, instead of an array of dates, the 'corrections' field holds an array of objects with a 'correctedDate' field.

…ues#1120]

Update a comment in the docmap-parser to accurately reflect the function's purpose. It now states 'Update preprint with corrections'.

…reprints-issues#1120]

…prints-issues#1120]

Update test and fixture in docmap parser to check for corrections on a
published version of record. Test and fixture names have been changed
to reflect this update.

…enhanced-preprints-issues#1120]

In the docmap-parser and its corresponding test file, a new 'content' field
has been added to the 'Correction' type. This field is populated with the
URLs of the corrected versions of records.

…reprints-issues#1120]

Refactored the way content is filtered in the docmap-parser. Previous
method used a filter then map combination, but it has been replaced
with a more efficient reduce method. This enhancement is specifically
for the parsing of 'web-page' type content with valid URLs.

…d-preprints-issues#1120]

This commit introduces a new function, getPublishedOutput, in docmap-parser.
This function checks the length of preprintOutputs and versionOfRecordOutputs
and returns the first item if there's one, otherwise it returns false. The
existing function getPublishedVersionOfRecord has been updated to use the newly
implemented getPublishedOutput function.

…nts-issues#1120]