Allow creating syncer with already parsed Ledger

[Nef10]

No description provided.

[github-actions]

Coverage after merging ledger into main

0.00%

Coverage Report

File	Stmts	Funcs	Lines	Uncovered Lines
/Users/runner/work/SwiftBeanCountSheetSync/SwiftBeanCountSheetSync/Sources/SwiftBeanCountSheetSync
Downloader.swift	0%	0%	0%	16–38, 40–54, 56–68
LedgerReader.swift	0%	0%	0%	15–22, 24–61
LedgerSettings.swift	0%	0%	0%	62–70
SheetDownloader.swift	0%	0%	0%	19–26, 29–33, 35–51
SheetParser.swift	0%	0%	0%	100–107, 109–115, 117–138, 20–29, 50–54, 56–75, 77–99
Syncer.swift	0%	0%	0%	100–103, 105–115, 117–122, 124–133, 139–141, 143–145, 147–149, 151–157, 160–178, 27–36, 57–62, 82–85, 91–94, 97–99
TransactionMapper.swift	0%	0%	0%	13–15, 17–38
Uploader.swift	0%	0%	0%	16–37, 43–47