Add new packages for JSON-based OTLP exporters as alternatives to the existing
Protobuf-based exporters:
- opentelemetry-exporter-otlp-json-common: Common JSON encoding functionality
- opentelemetry-exporter-otlp-json-http: HTTP transport implementation

These exporters enable compatibility with services requiring JSON format
instead of Protobuf. Implementation includes full support for traces, metrics,
and logs with comprehensive test coverage following project guidelines.

Closes open-telemetry#1003

Replace 'too-many-positional-arguments' with the correct pylint message ID 'too-many-arguments'
and fix type ignore comments placement for imports without stubs.

Replace string representation of integers with actual integer values in the OTLP JSON exporters
to comply with the OTLP specification. This ensures integer attributes are properly encoded as
{intValue: 123} instead of {intValue: 123} for better compatibility with OTLP receivers.

…exporter