Add bit-aligned / sub-byte PDO entry support to the emulator

[leducp]

Lets the emulator host slaves that declare sub-byte PDO entries (e.g.
4 BOOL GPIOs at 1):

• EmulatedESC honors FMMU logical/physical bit offsets via a per-bit slow path; byte-aligned mappings keep the memcpy fast path. FMMUs targeting addresses < 0x1000 (e.g. mailbox-status) now work.
• CoE::Entry gains data_bit_offset; addEntry/EsiParser allocate (bitlen+7)/8 bytes (was 0 for BOOL/BIT2..7). New copyBits / read/writeEntryBits helpers.
• SDO upload/download/complete-access switched to bit-accurate payload positioning. Sub-byte entries travel as 1 octet per ETG1000.5 §5.3.1; CA packs entries by bitoff per ETG2000.

[leducp]

ping @phamnhatha090805 this PR should enable bit support for the emulator and the stack in general

[leducp]

!!! Need proper testing before merge !!!

[github-actions]

File	Coverage	Lines	Branches
All files	78%	81%	76%	✅
lib/include/kickcat/Error.h	91%	100%	83%	✅
lib/include/kickcat/SBufQueue.h	80%	98%	63%	✅
lib/master/src/Bus.cc	90%	92%	89%	✅
lib/master/src/CoE.cc	61%	71%	51%	❌
lib/master/src/Link.cc	98%	100%	97%	✅
lib/master/src/MailboxSequencer.cc	97%	100%	94%	✅
lib/master/src/MasterOD.cc	99%	98%	100%	✅
lib/master/src/Prints.cc	95%	95%	95%	✅
lib/master/src/Slave.cc	21%	39%	3%	❌
lib/master/src/dc.cc	0%	0%	0%	❌
lib/slave/src/AbstractESC.cc	92%	100%	84%	✅
lib/slave/src/AbstractEmulatedEEPROM.cc	0%	0%	0%	❌
lib/slave/src/ESMStates.cc	96%	98%	94%	✅
lib/slave/src/ESM.cc	95%	100%	90%	✅
lib/slave/src/PDO.cc	92%	97%	88%	✅
lib/slave/src/ESC/EmulatedESC.cc	61%	68%	55%	❌
lib/slave/src/ESC/Lan9252.cc	0%	0%	0%	❌
lib/src/Frame.cc	98%	100%	97%	✅
lib/src/Mailbox.cc	90%	94%	86%	✅
lib/src/SIIParser.cc	40%	50%	30%	❌
lib/src/protocol.cc	94%	92%	96%	✅
lib/src/CoE/EsiParser.cc	92%	95%	90%	✅
lib/src/CoE/OD.cc	98%	98%	97%	✅
lib/src/CoE/protocol.cc	93%	93%	94%	✅
lib/src/CoE/CiA/DS402/StateMachine.cc	93%	94%	92%	✅
lib/src/CoE/mailbox/request.cc	80%	84%	76%	✅
lib/src/CoE/mailbox/response.cc	92%	97%	88%	✅
lib/src/EoE/protocol.cc	0%	0%	0%	❌

Minimum allowed coverage is 75%

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