[PATCH 2/2] imap-hibernate: Use imap-parser API for parsing DONE command

[PATCH 2/2] imap-hibernate: Use imap-parser API for parsing DONE command

Replace the ad-hoc DONE/IDLE tokenizer with imap-parser.h: use
imap_parser_read_tag() to read the tag and imap_parser_read_word() to
read the DONE and IDLE keywords. This delegates bounds checks and
character validation to the shared parser.

Gbp-Pq: Name 0002-imap-hibernate-Use-imap-parser-API-for-parsing-DONE-.patch