* [azure-core-cpp] Update to 1.8.0
## 1.8.0 (2023-02-02)
### Features Added
- Added support for parsing space character in place of 'T' in RFC3339 DateTimes.
- Added support for HTTP proxy servers, both unauthenticated and with basic authentication.
- Added universal support for several TLS options:
- Added the ability to set the expected TLS root certificate for TLS connection (useful if a proxy server uses a TLS certificate that is not chained to a known root).
- Added the ability to enable TLS certificate revocation list checks (off by default).
- For libcurl only: Allow TLS connection to succeed if CRL retrieval fails.
- *NOTE*: This change only applies if libcurl is built using the OpenSSL crypto backend. It does NOT apply if libcurl uses the schannel (Windows default) or SecureTransport (macOS/iOS default).
### Breaking Changes
- Changed the name of several distributed tracing HTTP span attributes:
- `requestId` is renamed to `az.client_request_id`
- `serviceRequestId` is renamed to `az.service_request_id`
- Bearer token authentication will not work for endpoint URL protocol schemes other than `"https"`. This ensures token security and is consistent with the Azure SDKs for other languages.
- Removed `noexcept` specification from `Azure::DateTime::clock::now()`.
- Updated retry policy timeouts to conform to Azure guidelines.
- The default delay between retries is changed from 4 seconds to 800ms.
- The maximum retry delay is changed from 2 minutes to 60 seconds (one minute).
If the original behavior is desired, customers can adjust these timeouts by changing the `RetryDelay` and `MaxRetryDelay` fields in the `RetryOptions` structure.
### Bugs Fixed
- Fixed bug in WinHTTP client which caused the `IgnoreUnknownCertificateAuthority` and `EnableCertificateRevocationListCheck` fields to be ignored if they were passed in from `TransportOptions`.
- [[#4206]](https://github.com/Azure/azure-sdk-for-cpp/issues/4206) Fixed connectivity issues in libcurl HTTP transport which can occur if a TCP connection is dropped prematurely. (A community contribution, courtesy of _[ahojnnes](https://github.com/ahojnnes)_)
### Other Changes
- Update distributed tracing attributes to align with current Azure Distributed Tracing Conventions attributes and names.
- Added the ability to consume version 1.1.1n of OpenSSL.
- Added support for Identity token caching, and for configuring token refresh offset in `BearerTokenAuthenticationPolicy`.
- Improved cancellation support for WinHTTP transport.
### Acknowledgments
Thank you to our developer community members who helped to make Azure Core better with their contributions to this release:
- Johannes Schonberger _([GitHub](https://github.com/ahojnnes))_
* [azure-core-tracing-opentelemetry-cpp] Update to 1.0.0-beta.4
## 1.0.0-beta.4 (2023-02-02)
### Features Added
- Aligned OpenTelemetry tracing infrastructure with OpenTelemetry 1.17.0 conventions for use with Azure Monitor.
### Other Changes
- Suppress several warnings from opentelemetry-cpp package.
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