Compile time support

[bobozaur]

Adds compile-time query macros and sqlx-exasol-cli, sqlx-cli like tool. Depends on launchbadge/sqlx#3889.

TODO:

• Get the publish workflow up to speed.
• Consider renaming ExaIter to ExaParamsArray.
• Look into sqlx_core::net::BufferedSocket.
• Look into reusing the StatementCache from sqlx_core.
• Update to latest sqlx changes and make use of forward_encode_impl! for arrays and string types.
• Impl ExaHasArrayType to limit usage of array types to one dimensional arrays.
• Move tests to a newer version of Exasol.
• Review the MAX_PRECISION of integer types.
• Review dependency graph and try to upgrade dependencies' versions.
• Test a custom wrapper type at compile time, including as an array of parameters.
• Review proc-macro customizations.
• Maybe get rid of anyhow in tests and use BoxDynError instead?

Documentation:

• Update README.md and lib.rs
• Update ETL docs
• Review all crates docs
• Document the removal of Encode for &mut [T]
• Document either usage of extern crate sqlx_exasol as sqlx; or using package in Cargo.toml to satisfy internal SQLx path qualifications (see Configurable macros namespace launchbadge/sqlx#3944).
• Document the removal of ExaDataType::compatible in favor of TypeInfo::type_compatible
• Document the removal of ExaDataType::Null
• Document the removal of uint support, 128 bit ints and f32.
• Document addition of ExaIntervalYearToMonth and ExaIntervalDayToSecond
• Document addition of Encode/Decode for Json
• Document the HASHTYPE_FORMAT caveat used for Uuid.
• Document the HashType newtype.
• Document the geo-types feature (and that they do not work at compile time as prepared statement parameters implicitly due to Wrong parameter type for GEOMETRY columns exasol/websocket-api#39).
• Document the types module with list of supported types and Exasol equivalents
• Document the addition of ProtocolVersion::V5
• Document the addition of ExaCompressionMode
• Update CHANGELOG
• Add to CHANGELOG that tests and fixes were done around TLS and compression IO combos
• Document the updated Debug impl for ExaWriter and ExaReader
• Document the removal of protocol-version parameter from the connection string and ExaConnectOptionsBuilder as well as making ProtocolVersion private.

Closes #9 .