Add semantic conventions for process resource to api/standard package

[MrAlias]

Attribute	Description	Example	Required
process.pid	Process identifier (PID).	1234	Yes
process.executable.name	The name of the process executable. On Unix based systems, can be set to the Name in proc/[pid]/status. On Windows, can be set to the base name of GetProcessImageFileNameW.	otelcol	See below
process.executable.path	The full path to the process executable. On Unix based systems, can be set to the target of proc/[pid]/exe. On Windows, can be set to the result of GetProcessImageFileNameW.	/usr/bin/cmd/otelcol	See below
process.command	The command used to launch the process (i.e. the command name). On Unix based systems, can be set to the zeroth string in proc/[pid]/cmdline. On Windows, can be set to the first parameter extracted from GetCommandLineW.	cmd/otelcol	See below
process.command_line	The full command used to launch the process. The value can be either a list of strings representing the ordered list of arguments, or a single string representing the full command. On Unix based systems, can be set to the list of null-delimited strings extracted from proc/[pid]/cmdline. On Windows, can be set to the result of GetCommandLineW.	Unix: [ cmd/otecol, --config=config.yaml ], Windows: cmd/otecol --config=config.yaml	See below
process.owner	The username of the user that owns the process.	root	No

Related to open-telemetry/opentelemetry-specification#635