Add missing license headers to comply with Apache-2.0

[leongross]

Update all source files to include the complete Apache 2 license header.

[github-actions]

license-eye has checked 72 files.

Valid	Invalid	Ignored	Fixed
0	57	15	0

Click to see the invalid file list

• examples/platform/cert_store.rs
• examples/platform/certs.rs
• examples/platform/crypto.rs
• examples/platform/evidence.rs
• examples/platform/mod.rs
• examples/platform/socket_transport.rs
• examples/spdm_requester.rs
• examples/spdm_responder.rs
• src/cert_store.rs
• src/chunk_ctx.rs
• src/codec.rs
• src/commands/algorithms/mod.rs
• src/commands/algorithms/request.rs
• src/commands/algorithms/response.rs
• src/commands/capabilities/mod.rs
• src/commands/capabilities/request.rs
• src/commands/capabilities/response.rs
• src/commands/certificate/mod.rs
• src/commands/certificate/request.rs
• src/commands/certificate/response.rs
• src/commands/challenge/mod.rs
• src/commands/challenge/request.rs
• src/commands/challenge/response.rs
• src/commands/chunk_get_rsp.rs
• src/commands/digests/mod.rs
• src/commands/digests/request.rs
• src/commands/digests/response.rs
• src/commands/error_rsp.rs
• src/commands/measurements_rsp.rs
• src/commands/mod.rs
• src/commands/version/mod.rs
• src/commands/version/request.rs
• src/commands/version/response.rs
• src/context.rs
• src/error.rs
• src/lib.rs
• src/measurements/common.rs
• src/measurements/freeform_manifest.rs
• src/measurements/mod.rs
• src/platform/evidence.rs
• src/platform/hash.rs
• src/platform/mod.rs
• src/platform/rng.rs
• src/platform/transport.rs
• src/protocol/algorithms.rs
• src/protocol/capabilities.rs
• src/protocol/certs.rs
• src/protocol/common.rs
• src/protocol/mod.rs
• src/protocol/signature.rs
• src/protocol/version.rs
• src/requester.rs
• src/state.rs
• src/test.rs
• src/transcript.rs
• src/transport.rs
• tests/spdm_validator_host.rs

Use this command to fix any missing license headers

```bash

docker run -it --rm -v $(pwd):/github/workspace apache/skywalking-eyes header fix

</details>

[embediver]

We should then drop this old license line in every file.