v1 API freeze

[mkungla]

Summary This is default task list of approved changes to v1.

Description This library was put together quickly to serve initial needs. It is acknowledged that Go API types, function signatures etc. may not be fully universal and have room for improvements before v1.0.0 release.

Your welcome to comment or open new issues if you have proposals for library API enhancements before v1.0.0 is released.

• [x] #2
• [x] #3
• [x] #4
• [x] #5
• [x] #6
• [x] #7
• [x] #8
• [x] cardano-community/koios-artifacts#3
• [x] https://github.com/cardano-community/guild-operators/pull/1389
• [x] #16
• [x] #17
• [x] #18
• [x] #19
• [x] #21
• [x] #22