Monotonic rewrite (#874)

* Rework timer_queue and monotonic architecture

Goals:
 * make Monotonic purely internal
 * make Monotonic purely tick passed, no fugit involved
 * create a wrapper struct in the user's code via a macro that then
   converts the "now" from the tick based monotonic to a fugit based
   timestamp

We need to proxy the delay functions of the timer queue anyway,
so we could simply perform the conversion in those proxy functions.

* Update cargo.lock

* Update readme of rtic-time

* CI: ESP32: Redact esp_image: Too volatile

* Fixup: Changelog double entry rebase mistake

---------

Co-authored-by: Henrik Tjäder <henrik@tjaders.com>

examples/stm32g030f6_periodic_prints/Cargo.toml

@@ -0,0 +1,48 @@
+[package]
+authors = ["Finomnis <finomnis@gmail.com>"]
+name = "stm32g030f6_periodic_prints"
+edition = "2021"
+version = "0.1.0"
+
+[workspace]
+
+
+[dependencies.rtic]
+path = "../../rtic"
+version = "2.0.1"
+features = ["thumbv6-backend"]
+
+[dependencies.rtic-monotonics]
+path = "../../rtic-monotonics"
+version = "2.0.0"
+features = ["stm32g030f6", "stm32_tim3"]
+
+
+[dependencies]
+cortex-m = { version = "0.7.7", features = ["critical-section-single-core"] }
+cortex-m-rt = "0.7.3"
+defmt = "0.3.4"
+defmt-rtt = "0.4.0"
+fugit = "0.3.7"
+panic-probe = { version = "0.3.1", features = ["print-defmt"] }
+
+stm32g0xx-hal = { version = "0.2.0", features = ["rt", "stm32g030"] }
+
+# cargo build/run
+[profile.dev]
+codegen-units = 1
+debug = 2
+debug-assertions = true # <-
+incremental = false
+opt-level = 3           # <-
+overflow-checks = true  # <-
+
+# cargo build/run --release
+[profile.release]
+codegen-units = 1
+debug = 2
+debug-assertions = false # <-
+incremental = false
+lto = 'fat'
+opt-level = 3            # <-
+overflow-checks = false  # <-