Recommend OTEL_EXPORTER_OTLP_*COMPRESSION "none" by default

[tigrannajaryan]

The topic was discussed by the TC and the resolution is:

• We believe that having a locally running Collector is common.
• The SDK defaults are optimized for this scenario. For example the default endpoints that SDKs send to are "localhost".
• In line with this we also believe that the default setting for compression options should be "none". Enabling compression when sending to localhost increases CPU consumption and is unnecessary.
• We think that it is not desirable to make one option's default value depend on another option's value (e.g. make "gzip" default compression if the destination is not "localhost").
• Some SDKs will know for certain or with high probability that the typical destination they send to is not local. For example this may be the case for in-browser JS SDK or for mobile Android SDK. For such SDKs we want to allow to choose a different default setting for compression.

Therefore the TC believes that:

• The default recommended value for OTEL_EXPORTER_OTLP_*COMPRESSION option in the spec should be "none". [this needs to be changed in the spec to add recommendation].
• The spec will allow SDKs to deviate from this recommendation as explained above. [this is already part of the spec]

[arminru]

For reference: This is related to #1895 which proposed the opposite.