feat(clp): Postpone GlobalMetadataDB updates until archive writing finishes (fixes #685).

[davemarco]

Description

See @685 for high level PR goals.

re: implementation

Removed all writes during serialization to Global metadata DB.

When the archive serialization is complete, I do two things.
(1) I add the archive metadata to the global metadata DB.
(2) I copy all the file metadata from the archive-level metadataDB to the global metadataDB.

re: I explored other methods such as maintaining a list of files in the archive writer class, and adding files to the list as they are compressed. Then at the end, i could add the list to global DB. However, I thought this could be more prone to bugs if someone adds a new method to compress files, or if the file metadata is altered at a later point. Moreover, we are storing the data twice, once in archive writer and once in local DB. Therefore, I thought a simple solution was just to query the local DB at the end, and copy over the metadata.

Validation performed

TBD - draft

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