…1737)

* Add trait codegen plugin

* Add bincompat traits and validators

* Support bincompat codegen

* Add new/updated generated code

* Add MiMa tests for generated code

* Extract scalaCli object

* Restore support for extraJars

* Add concrete test for bincompat-friendly traits

* Extract helper for trait usage tests

* Add scaladoc and failure info

* add note

* Organize code, oops

* adjust comment

* Support bincompat-friendly enums

* Don't render defaults in `copy` for single-field structs

* Add notes, todos

* Fix codegen on 2.12

* Format tests

* Constrain version formats

* Render defaults in baseline apply

* formatting

* Improve docs & tests around VersionNumber

* Add nullable example

* Remove todos, test for negative compilation

* Make bincompat unions closer to real ones

* add changelog entry

* Add initial version of docs

* explain structs

* Add link to readme

* move back to 39

* Move back to .40

…ly filter certain forward issues (#1780)

* bincompat tests: Use --compile-only-jar / compile-only-dependency

* Be more strict in what kind of issues we filter in the test

* update changelog

* Run protocol publishLocal with a cache

* ignore nonexistent files

* Use usual sbt caching business

* take version into account

* When signing requests for AWS, double-encode URI paths for any requests not being sent to S3

* URI-encode HTTP label values inserted as URI path segments

* exclude most AWS codecs from using encoded HTTP label values

* use imperative style to implement PathEncode.encodeUnreserved, per the request in the PR

(the imperative code was converted from Java to Scala by IntelliJ)

* address minor PR comments

* move HTTP label URL encoding decision to instance level instead of deciding based on method parameter values

* use java.net.URI#normalize to do most of the URI path normalization when signing AWS requests

* update changelog with the changes in this PR for v0.18.40

* Update smithytranslate-proto to 0.5.10

* Update alloy to 0.3.29 for testing with its updated compliance tests

* prepare to seal HttpEndpoint to avoid forward compatibility issues

* Implement open lenient unions

* WIP - approach with document wrapper

* Bleh

* Approach with a separate class for handlers

* Remove leftover generated class + fix typo + fix path issues

* Get rid of warning

* Fix npe

* Get rid of unused import

* One more

* Cleanup + some tests

* Unified union codec impl

* Fix warning

* Address minor todos

* Fix test warning

* Compile things once

* Fix weird warning

* Reformat

* PR comments

* Add changelog entry

* empty commit because we actually need to run CI...

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Co-authored-by: Jakub Kozłowski <kubukoz@gmail.com>