add support for the imap quota extension (RFC 2087)

[urkle]

Here is my first-stab at adding in support for the quota extension (already in imap-proto).

A few things I don't like with it right now.

1. it exposes some of the imap-proto structs (QuotaResource)

• I can create local QuotaResource and map them.

2. the "getquotaroot" is "fun" as it returns 2 resources, (1) QUOTAROOT and (n) QUOTAs.

• The issue here is that I have to run parse_many_into twice to get both resource sets. (unless I just don't use parse_many_into and just duplicate most of that in the method which I may do)
• this also causes a difference in response types.. e.g. set_quota and get_quota return a local Quota struct, but I the get_quota_root returns the imap-proto Quota struct (I did not see any easy way to convert ouroboros structs).

Anyways, it's starting point.. Please provide feedback. (this and #227) are two pieces of functionality I'll need for the application I'm building.

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This change is 

[urkle]

@jonhoo a bunch of changes and I applied all your feedback.. the result is much cleaner IMHO that the first draft.

And once #228 is merged in I'll add more integration tests..

[urkle]

@jonhoo once #227 is merged I'll rebase this and apply the same changes to this branch.

[jonhoo]

@urkle #227 is now merged :tada:

[codecov[bot]]

Codecov Report

Merging #235 (9d9a3ce) into main (3a65407) will increase coverage by 1.2%. The diff coverage is 93.3%.

Additional details and impacted files

Impacted Files	Coverage Δ
src/lib.rs	100.0% <ø> (ø)
src/types/quota.rs	87.6% <87.6%> (ø)
src/client.rs	93.1% <94.9%> (+0.6%)	:arrow_up:
src/parse.rs	89.9% <95.1%> (+0.5%)	:arrow_up:
src/utils.rs	100.0% <100.0%> (ø)

[urkle]

@jonhoo fixups pushed and your comments have been either fixed or replied to (For further discussion)

[urkle]

@jonhoo ooh.. you merged it with the fixup commits.. you probably should have either used the github squash merge or asked me to squash it down..

[jonhoo]

Oops, yes, completely forgot about those! My bad. Oh well, not the end of the world 😅