Add address lot resource and data source.

[jmcarp]

Resolves #468.
Resolves #469.

[jmcarp]

Manual acceptance testing, for now:

❯ TEST_ACC_NAME=TestAccAddressLot make testacc          
-> Running terraform acceptance tests
=== RUN   TestAccAddressLot
=== PAUSE TestAccAddressLot
=== CONT  TestAccAddressLot
--- PASS: TestAccAddressLot (1.91s)
PASS
ok  	github.com/oxidecomputer/terraform-provider-oxide/internal/provider	2.258s

❯ TEST_ACC_NAME=TestAccDataSourceAddressLot make testacc
-> Running terraform acceptance tests
=== RUN   TestAccDataSourceAddressLot
=== PAUSE TestAccDataSourceAddressLot
=== CONT  TestAccDataSourceAddressLot
--- PASS: TestAccDataSourceAddressLot (0.92s)
PASS
ok  	github.com/oxidecomputer/terraform-provider-oxide/internal/provider	1.270s

[internet-diglett]

Looks like this resolves #306 as well

[sudomateo]

Nice work on this! I left some feedback to update documentation and to confirm that the nested id attribute within the blocks attribute is okay because we've seen issues with non-empty refresh plans in the past with such a setup. I've discussed this issue on other pull requests (#426 (comment)) if you're curious for context.

[sudomateo]

Just noting that this will also need a changelog entry.

[sudomateo]

@jmcarp need anything to get this over the line?