build(deps): update dependencies

[SanchithHegde]

Type of Change

• Bugfix
• New feature
• Enhancement
• Refactoring
• Dependency updates
• Documentation
• CI/CD

Description

This PR includes the following changes:

• Updates opentelemetry crates to stable version (0.19)
• Updates AWS crates
• Uses upstream git URL for async-bb8-diesel
• Updates dependency versions for a few crates
• Reorders crates and formats the Cargo.toml files
• Moves the Rust edition, MSRV and license metadata to the workspace manifest file
• Removes the unused examples directory
• Moves the router build script out of the router/src directory into the router directory
• Adds description and READMEs to all crates' metadata, removes file tree layout from READMEs from most crates

Motivation and Context

N/A

How did you test it?

Created a successful payment via Postman.

Checklist

• I formatted the code cargo +nightly fmt --all
• I addressed lints thrown by cargo clippy
• I reviewed submitted code
• I added unit tests for my changes where possible
• I added a CHANGELOG entry if applicable

[ashokkjag]

• Can we take advantage of semver and just specify the x.y or just x rather than upgrading the z everytime? (x.y.z)
• Can we always have some github issue wherever we have a github reference in cargo.toml

[SanchithHegde]

• Can we take advantage of semver and just specify the x.y or just x rather than upgrading the z everytime? (x.y.z)

We can use major.minor for crates with major version >= 1, and use major.minor.patch format for crates with version 0.x.y. What do you say?

• Can we always have some github issue wherever we have a github reference in cargo.toml

Sure! As of now, only async-bb8-diesel is used as a git dependency since it hasn't been published on crates.io. For any other crates used as git dependencies, we'll have issues to track them moving forward.