Add MBED_ALL_STATS_ENABLED to config system

[kegilbert]

Description

Add MBED_ALL_STATS_ENABLED to the config system. Added define guards in mbed_stats.h to both disallow accidental conflicting redefines (which will generate a warning without the new guards), and to allow:

 "platform.all-stats-enabled": true,          
 "platform.cpu-stats-enabled": false          

to enable all stats but the CPU ones.

May get a merge conflict with #8734 after the rollup PR gets in, will fix when we get there.

Pull request type

[ ] Fix
[ ] Refactor
[ ] Target update
[X] Functionality change
[ ] Docs update
[ ] Test update
[ ] Breaking change

[cmonr]

@kegilbert New record? Already time for a rebase 😄

[kegilbert]

Gah waited all day for that rollup to get in, figured I'd put this PR up now....should've waited 30 minutes.

Updooted.

[cmonr]

Gah waited all day for that rollup to get in

That makes two of us...

[cmonr]

Might want to check with this as well, since it'll be next: #8760

[kegilbert]

[deepikabhavnani]

@kegilbert - Good work here, but I will like to wait for #8592.

@lauri-piikivi - Had query if network statistics config option should be in platform or network. Also we enable all stats in 'MBED_ALL_STATS_ENABLED'. With define it is not an issue, but in case of config should it be in feature/netsocket or platform?

[deepikabhavnani]

Suggested change

	#define MBED_SYS_STATS_ENABLED 1
	#define MBED_SYS_STATS_ENABLED 1

[deepikabhavnani]

We don't tab the code in #ifndef #endif. Similar change for other defines as well

[deepikabhavnani]

@lauri-piikivi - Network statistics will be kept separate from platform statistics. Will update the network stats PR accordingly.

[deepikabhavnani]

@kegilbert - Looks good to me, just small changes suggested.

[0xc0170]

/morph build

[mbed-ci]

Build : SUCCESS

Build number : 3687
Build artifacts/logs : http://mbed-os.s3-website-eu-west-1.amazonaws.com/?prefix=builds/8761/

Triggering tests

/morph test
/morph export-build
/morph mbed2-build

[mbed-ci]

Exporter Build : SUCCESS

Build number : 3288
Build artifacts/logs : http://mbed-os.s3-website-eu-west-1.amazonaws.com/?prefix=builds/exporter/8761/

[mbed-ci]

Test : FAILURE

Build number : 3461
Test logs :http://mbed-os-logs.s3-website-us-west-1.amazonaws.com/?prefix=logs/8761/3461

[0xc0170]

@kegilbert Can you please rebase?

[bulislaw]

All the PRs need to be engineering ready (marked as "needs: CI") by the end of the day (Austin time). Otherwise it won't make 5.11 and will need to come in the next release (5.12 for features, 5.11.1 for fixes and new platforms).

[cmonr]

@kegilbert Rebase now, or forever hold your peace.

[kegilbert]

@cmonr rebased

[cmonr]

CI restarted.

[mbed-ci]

Test run: SUCCESS

Summary: 4 of 4 test jobs passed
Build number : 3
Build artifacts
Build logs