Build Archives more robustly

[macneale4]

This change is long in coming. Several findings from building a large user database are incorporated here. Specifically:

• No longer storing all chunks in memory
• Cancellable process with ^C
• Progress reporting for major stages of the build
• No chunk grouping by default, --group-chunks to enable. Pathological cgo dictionary building problem needs to be fixed before we enable by default.
• Writing a useful metadata json block with dolt version and origin table file ID.

[coffeegoddd]

@macneale4 DOLT

comparing_percentages
100.000000 to 100.000000

version	result	total
6ee2664	ok	5937457

version	total_tests
6ee2664	5937457

correctness_percentage
100.0

[coffeegoddd]

@macneale4 DOLT

comparing_percentages
100.000000 to 100.000000

version	result	total
8f0f55a	ok	5937457

version	total_tests
8f0f55a	5937457

correctness_percentage
100.0

[coffeegoddd]

@coffeegoddd DOLT

comparing_percentages
100.000000 to 100.000000

version	result	total
672c882	ok	5937457

version	total_tests
672c882	5937457

correctness_percentage
100.0

[coffeegoddd]

@macneale4 DOLT

comparing_percentages
100.000000 to 100.000000

version	result	total
a001e1e	ok	5937457

version	total_tests
a001e1e	5937457

correctness_percentage
100.0

[fulghum]

LGTM! The support for canceling and the progress output is really, really nice. I only had a couple of really minor thoughts.

[coffeegoddd]

@macneale4 DOLT

comparing_percentages
100.000000 to 100.000000

version	result	total
23ea4fd	ok	5937457

version	total_tests
23ea4fd	5937457

correctness_percentage
100.0