[nrfconnect] Bring back BLE write requests

[Damian-Nordic]

Problem

PR #6955, apart from changing from BLE indications to notifications on nRF Connect platform, started require
controllers to use only GATT WriteCommand procedure (aka Write without response) as that is required by the spec.

However, Darwin platform layer still uses WriteRequest (aka Write with response) method, so the change broke compatibility between mac and nRF Connect platforms.

Change overview

Support both methods on the firmware side until all platforms switch to the new spec-recommended method.

Testing

No unit or integration tests are added/modified as the change can only be tested on hardware.
The change has been tested manually by using Python CHIP Controller on mac OS and nRF Connect lock-app.

[github-actions]

Size increase report for "esp32-example-build" from 82a8544

File	Section	File	VM
chip-all-clusters-app.elf	.flash.text	16	16
chip-all-clusters-app.elf	.flash.rodata	4	4

Full report output

BLOAT REPORT

Files found only in the build output:
    report.csv

Comparing ./master_artifact/chip-pigweed-app.elf and ./pull_artifact/chip-pigweed-app.elf:

sections,vmsize,filesize

Comparing ./master_artifact/chip-all-clusters-app.elf and ./pull_artifact/chip-all-clusters-app.elf:

sections,vmsize,filesize
.xt.lit._ZN12QRCodeScreenD5Ev,0,88
.xt.prop._ZN12QRCodeScreenD5Ev,0,52
.xt.prop._ZN4chip9Transport16AdminPairingInfo5ResetEv,0,40
.flash.text,16,16
.flash.rodata,4,4
[Unmapped],0,-4
.xt.prop._ZN4chip8Platform3NewINS_9Transport16AdminPairingInfo24StorableAdminPairingInfoEJEEEPT_DpOT0_,0,-12
.xt.prop._ZNSt6vectorIhSaIhEE17_M_default_appendEj,0,-40
.xt.lit._ZN4chip8Platform3NewINS_9Transport16AdminPairingInfo24StorableAdminPairingInfoEJEEEPT_DpOT0_,0,-48
.xt.lit._ZNSt6vectorIhSaIhEE17_M_default_appendEj,0,-80