feat: assets can have a display name

[rix0rrr]

Add a new field to the asset schema: displayName.

If supplied, it will be used instead of the asset ID for display purposes in cdk-assets and in the CLI.

This adds support for display names to the contract and to the CLI. A future PR in aws-cdk-lib will make it possible to configure display names on Asset objects, and add the same support to CDK Pipelines.

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By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 77.14286% with 16 lines in your changes missing coverage. Please review.

Project coverage is 85.19%. Comparing base (12299ff) to head (5d36bad).
Report is 31 commits behind head on main.

Files with missing lines	Patch %	Lines
packages/cdk-assets/lib/asset-manifest.ts	81.81%	8 Missing ⚠️
packages/cdk-assets/lib/publishing.ts	0.00%	6 Missing ⚠️
...ackages/aws-cdk/lib/api/deployments/deployments.ts	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #175      +/-   ##
==========================================
+ Coverage   84.84%   85.19%   +0.35%     
==========================================
  Files         205      205              
  Lines       35648    35701      +53     
  Branches     4617     4633      +16     
==========================================
+ Hits        30245    30417     +172     
+ Misses       5245     5128     -117     
+ Partials      158      156       -2     

Flag	Coverage Δ
suite.unit	85.19% <77.14%> (+0.35%)	⬆️

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